feat(mcp): brain_pending + brain_promote tools + REST routes (#38)

Wires the curation primitives into the MCP surface (all three sites:
tools() descriptors, handleCall dispatch, package doc) and registers the
GET /pending + POST /promote REST routes. brain_promote additionally
re-indexes the promoted note into the graph (best-effort), matching the
other write paths. brain_pending is the human-review-queue complement to
the agent-facing brain_write.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

ingestion/cmd/server/main.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"net/url"
 	"os"
+	"path/filepath"
 	"strconv"
 	"strings"
 	"time"
@@ -15,8 +16,13 @@ import (
 	chassisauth "gitea.d-ma.be/mathias/mcp-chassis/auth"
 
 	"github.com/mathiasbq/hyperguild/ingestion/internal/api"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/audit"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capture"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capturehttp"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/classification"
 	"github.com/mathiasbq/hyperguild/ingestion/internal/claudewatcher"
 	"github.com/mathiasbq/hyperguild/ingestion/internal/embed"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/gitea"
 	"github.com/mathiasbq/hyperguild/ingestion/internal/graphstore"
 	"github.com/mathiasbq/hyperguild/ingestion/internal/graphsync"
 	"github.com/mathiasbq/hyperguild/ingestion/internal/llm"
@@ -118,6 +124,47 @@ func envInt(key string, fallback int) int {
 	return fallback
 }
 
+// buildAuditSink selects the capture audit sink. When BRAIN_LOKI_URL is
+// set it builds the classification-aware DegradingSink (loki central +
+// durable file buffer + optional ntfy) and starts the reconcile loop;
+// otherwise it falls back to a plain slog sink. The buffer lives under the
+// brain dir so it survives process restarts.
+func buildAuditSink(ctx context.Context, brainDir string, logger *slog.Logger) capture.AuditSink {
+	lokiURL := os.Getenv("BRAIN_LOKI_URL")
+	central := audit.NewLokiCentral(lokiURL)
+	if central == nil {
+		logger.Info("capture audit: slog sink (BRAIN_LOKI_URL unset)")
+		return audit.NewSlogSink(logger)
+	}
+	buffer, err := audit.NewFileBuffer(filepath.Join(brainDir, ".audit-buffer", "capture.jsonl"))
+	if err != nil {
+		logger.Error("capture audit buffer init", "err", err)
+		os.Exit(1)
+	}
+	// Keep notifier as a nil interface (not a typed-nil) when unconfigured
+	// so DegradingSink/Reconcile skip it cleanly.
+	var notifier audit.Notifier
+	if n := audit.NewNtfyNotifier(os.Getenv("BRAIN_NTFY_URL"), os.Getenv("BRAIN_NTFY_TOKEN")); n != nil {
+		notifier = n
+	}
+	reconcileInterval := time.Duration(envInt("BRAIN_AUDIT_RECONCILE_INTERVAL", 60)) * time.Second
+	audit.StartReconcile(ctx, central, buffer, notifier, reconcileInterval)
+	logger.Info("capture audit: loki+buffer sink", "loki", lokiURL, "reconcile_s", int(reconcileInterval.Seconds()))
+	return audit.NewDegradingSink(central, buffer, notifier)
+}
+
+// splitList parses a comma-separated env value into a trimmed,
+// empty-free slice. Used for the capture sovereign-principal allowlist.
+func splitList(v string) []string {
+	var out []string
+	for _, p := range strings.Split(v, ",") {
+		if p = strings.TrimSpace(p); p != "" {
+			out = append(out, p)
+		}
+	}
+	return out
+}
+
 // systemHostname returns os.Hostname() with a "unknown" fallback so the
 // caller never has to handle the rare error path.
 func systemHostname() string {
@@ -175,6 +222,15 @@ func main() {
 		logger.Info("brain reranker configured", "url", rerankURL, "model", rerankModel)
 	}
 
+	// Gitea ticket tracker for the capture capability (#52). Token via env
+	// only — never logged or in argv. Both vars must be set to enable it;
+	// gitea.New returns nil otherwise, leaving ticket integration off.
+	giteaURL := envOr("BRAIN_GITEA_URL", "https://git.d-ma.be")
+	if tracker := gitea.New(giteaURL, os.Getenv("BRAIN_GITEA_TOKEN")); tracker != nil {
+		mcpSrv = mcpSrv.WithIssueTracker(tracker)
+		logger.Info("brain gitea tracker configured", "url", giteaURL)
+	}
+
 	// Hybrid retrieval (pgvector + nomic-embed-text). Both env vars must
 	// be set together for the path to wire on; otherwise BM25-only.
 	var vectorStore *vectorstore.PGStore
@@ -313,6 +369,8 @@ func main() {
 	mux.HandleFunc("POST /ingest-path", h.IngestPath)
 	mux.HandleFunc("POST /ingest-raw", h.IngestRaw)
 	mux.HandleFunc("POST /backfill-refs", h.BackfillRefs)
+	mux.HandleFunc("GET /pending", h.Pending)
+	mux.HandleFunc("POST /promote", h.Promote)
 	mux.HandleFunc("POST /backfill-embeddings", h.BackfillEmbeddings)
 	mux.HandleFunc("GET /pass-rate", h.PassRate)
 	jwtValidator, err := chassisauth.NewJWTValidator(ctx, os.Getenv("DEX_ISSUER_URL"), os.Getenv("MCP_AUDIENCE"))
@@ -339,6 +397,41 @@ func main() {
 
 	mux.Handle("/mcp", chassisauth.BearerMiddleware(mcpToken, jwtValidator, "brain", resourceMetadataURL, mcpSrv))
 
+	// POST /capture (#53/#54): the uniform capture REST door. Needs a ticket
+	// tracker to file action items, so it only mounts when Gitea is
+	// configured. It reuses the MCP server's graph-wired brain store (one
+	// implementation), the classification tags for the I1 gate, and a
+	// classification-aware audit sink (loki + durable buffer + ntfy when
+	// BRAIN_LOKI_URL is set, else a plain slog sink). The handler does its
+	// own auth (static + JWT) because it needs the principal to derive the
+	// trust-zone origin — the chassis middleware hides it.
+	if tracker := mcpSrv.IssueTracker(); tracker != nil {
+		classCfg, cerr := classification.Load(brainDir)
+		if cerr != nil {
+			logger.Error("load classification config", "err", cerr)
+			os.Exit(1)
+		}
+		auditSink := buildAuditSink(ctx, brainDir, logger)
+		// The Gitea client also satisfies SummaryWriter (#66): session
+		// summaries are written to mathias/ai-sessions over the same API
+		// token. nil only if a future tracker impl lacks file writes.
+		summaryWriter, _ := tracker.(capture.SummaryWriter)
+		captureSvc := capture.NewService(
+			mcpSrv.BrainStore(), tracker, summaryWriter, classCfg, auditSink)
+		sovereign := splitList(os.Getenv("BRAIN_CAPTURE_SOVEREIGN_PRINCIPALS"))
+		resolver := capturehttp.NewOriginResolver(sovereign)
+		captureH := capturehttp.New(captureSvc, jwtValidator, mcpToken, "local-cli", resolver)
+		mux.Handle("POST /capture", captureH)
+		// Same use-case behind the MCP `capture` tool (#55 relay) so MCP-native
+		// harnesses (claude.ai, Crush, Pi, LLM Council) reach capture through
+		// the existing /mcp OAuth connector. mcpSrv is already wrapped above;
+		// WithCapture mutates the same instance, so the tool appears live.
+		mcpSrv.WithCapture(captureSvc, jwtValidator, mcpToken, "local-cli", resolver)
+		logger.Info("capture enabled (REST + MCP tool)", "sovereign_principals", len(sovereign))
+	} else {
+		logger.Info("capture endpoint disabled (BRAIN_GITEA_TOKEN unset)")
+	}
+
 	// Opt-in OAuth 2.0 client_credentials flow for claude.ai's custom-MCP
 	// integration UI, which has no static-Bearer field. Setting both
 	// OAUTH_CLIENT_ID and OAUTH_CLIENT_SECRET enables the token exchange;

ingestion/internal/api/handler.go

@@ -483,6 +483,40 @@ func (h *Handler) BackfillRefs(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, map[string]int{"updated": n})
 }
 
+// Pending handles GET /pending — list raw/ notes awaiting promotion.
+func (h *Handler) Pending(w http.ResponseWriter, _ *http.Request) {
+	pending, err := ListPending(h.brainDir)
+	if err != nil {
+		h.logger.Error("pending failed", "err", err)
+		writeError(w, http.StatusInternalServerError, "pending error")
+		return
+	}
+	writeJSON(w, map[string]any{"pending": pending})
+}
+
+type promoteRequest struct {
+	Filename string `json:"filename"`
+	Wing     string `json:"wing"`
+	Hall     string `json:"hall"`
+	Slug     string `json:"slug,omitempty"`
+}
+
+// Promote handles POST /promote — move a raw/ note into the wiki. A bad
+// hall / collision / missing source is a 400 (caller error), not a 500.
+func (h *Handler) Promote(w http.ResponseWriter, r *http.Request) {
+	var req promoteRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		writeError(w, http.StatusBadRequest, "invalid JSON")
+		return
+	}
+	rel, err := PromoteNote(h.brainDir, PromoteOptions(req))
+	if err != nil {
+		writeError(w, http.StatusBadRequest, err.Error())
+		return
+	}
+	writeJSON(w, map[string]string{"path": rel})
+}
+
 func writeJSON(w http.ResponseWriter, v any) {
 	w.Header().Set("Content-Type", "application/json")
 	json.NewEncoder(w).Encode(v) //nolint:errcheck

ingestion/internal/api/promote.go

@@ -0,0 +1,156 @@
+package api
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"regexp"
+	"sort"
+	"strings"
+	"time"
+
+	"github.com/mathiasbq/hyperguild/ingestion/internal/brain"
+)
+
+// PendingNote describes a raw/ note awaiting human promotion to the wiki.
+type PendingNote struct {
+	Filename  string `json:"filename"`
+	CreatedAt string `json:"created_at"`
+	SizeBytes int64  `json:"size_bytes"`
+	Excerpt   string `json:"excerpt"`
+}
+
+// datePrefix matches a leading YYYY-MM-DD- on a raw filename, stripped when
+// deriving the default promoted slug.
+var datePrefix = regexp.MustCompile(`^\d{4}-\d{2}-\d{2}-`)
+
+// ListPending returns the notes in brain/raw/ awaiting review, oldest-first
+// (natural review order). An absent raw/ dir yields an empty slice, not an
+// error. Only .md files are listed; tunnel-candidate files are skipped.
+func ListPending(brainDir string) ([]PendingNote, error) {
+	dir := filepath.Join(brainDir, "raw")
+	entries, err := os.ReadDir(dir)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return []PendingNote{}, nil
+		}
+		return nil, fmt.Errorf("read raw dir: %w", err)
+	}
+
+	out := make([]PendingNote, 0, len(entries))
+	for _, e := range entries {
+		if e.IsDir() || !strings.HasSuffix(e.Name(), ".md") || strings.HasPrefix(e.Name(), "tunnel-candidates-") {
+			continue
+		}
+		info, statErr := e.Info()
+		if statErr != nil {
+			continue
+		}
+		raw, readErr := os.ReadFile(filepath.Join(dir, e.Name()))
+		if readErr != nil {
+			continue
+		}
+		fm, body := parseFrontmatter(string(raw))
+		created := fm.get("created_at")
+		if created == "" {
+			created = info.ModTime().UTC().Format(time.RFC3339)
+		}
+		out = append(out, PendingNote{
+			Filename:  e.Name(),
+			CreatedAt: created,
+			SizeBytes: info.Size(),
+			Excerpt:   excerpt(body, 200),
+		})
+	}
+	sort.SliceStable(out, func(i, j int) bool { return out[i].CreatedAt < out[j].CreatedAt })
+	return out, nil
+}
+
+// PromoteOptions identifies a raw note to promote and its wiki destination.
+type PromoteOptions struct {
+	Filename string // basename in brain/raw/
+	Wing     string
+	Hall     string
+	Slug     string // optional; defaults to Filename minus date prefix + .md
+}
+
+// PromoteNote moves a note from brain/raw/ into the structured wiki: it
+// rewrites frontmatter (sets wing/hall/promoted_at, preserves created_at and
+// any custom fields), writes to brain/wiki/<wing>/<hall>/<slug>.md, deletes
+// the source, then rebuilds the wing index and runs auto-tunnel detection.
+//
+// It is atomic from the caller's view: validation (hall, wing, slug,
+// collision) happens before any filesystem change, and the source is deleted
+// only after the destination write succeeds (write-then-delete, never move).
+// Returns the promoted note's path relative to brainDir.
+func PromoteNote(brainDir string, opts PromoteOptions) (string, error) {
+	// Validate filename (basename only — no traversal) before touching fs.
+	base := filepath.Base(opts.Filename)
+	if base != opts.Filename || base == "." || base == ".." || strings.ContainsAny(opts.Filename, `/\`) {
+		return "", fmt.Errorf("invalid filename %q", opts.Filename)
+	}
+
+	slug := opts.Slug
+	if slug == "" {
+		slug = datePrefix.ReplaceAllString(strings.TrimSuffix(base, ".md"), "")
+	}
+	// NotePath validates hall + wing + slug; do this before reading anything.
+	dest, err := brain.NotePath(brainDir, opts.Wing, opts.Hall, slug)
+	if err != nil {
+		return "", err
+	}
+
+	src := filepath.Join(brainDir, "raw", base)
+	raw, err := os.ReadFile(src)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return "", fmt.Errorf("pending note %q does not exist in raw/", base)
+		}
+		return "", fmt.Errorf("read source: %w", err)
+	}
+
+	// Collision: never silently overwrite an existing promoted note.
+	if _, statErr := os.Stat(dest); statErr == nil {
+		rel, _ := filepath.Rel(brainDir, dest)
+		return "", fmt.Errorf("target %s already exists; choose a different slug", filepath.ToSlash(rel))
+	}
+
+	fm, body := parseFrontmatter(string(raw))
+	now := time.Now().UTC().Format(time.RFC3339)
+	fm.set("wing", brain.Sanitise(opts.Wing))
+	fm.set("hall", opts.Hall)
+	if fm.get("created_at") == "" {
+		fm.set("created_at", now)
+	}
+	fm.set("promoted_at", now)
+
+	if err := os.MkdirAll(filepath.Dir(dest), 0o755); err != nil {
+		return "", fmt.Errorf("create wing dir: %w", err)
+	}
+	// Write-then-delete: the source survives any write failure.
+	if err := os.WriteFile(dest, []byte(fm.render()+body), 0o644); err != nil {
+		return "", fmt.Errorf("write promoted note: %w", err)
+	}
+	if err := os.Remove(src); err != nil {
+		return "", fmt.Errorf("promoted note written but source removal failed: %w", err)
+	}
+
+	rel, _ := filepath.Rel(brainDir, dest)
+	relSlash := filepath.ToSlash(rel)
+
+	// Best-effort wiki upkeep — the note is already promoted.
+	_ = brain.BuildWingIndex(brainDir, opts.Wing)
+	_ = brain.AutoTunnel(brainDir, relSlash, body)
+
+	return relSlash, nil
+}
+
+// excerpt returns the first n runes of s, trimmed, single-spaced.
+func excerpt(s string, n int) string {
+	s = strings.TrimSpace(s)
+	r := []rune(s)
+	if len(r) > n {
+		r = r[:n]
+	}
+	return strings.TrimSpace(string(r))
+}

ingestion/internal/api/promote_test.go

@@ -0,0 +1,121 @@
+package api
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func writeRaw(t *testing.T, brainDir, name, content string) {
+	t.Helper()
+	dir := filepath.Join(brainDir, "raw")
+	require.NoError(t, os.MkdirAll(dir, 0o755))
+	require.NoError(t, os.WriteFile(filepath.Join(dir, name), []byte(content), 0o644))
+}
+
+func TestListPendingEmptyWhenAbsent(t *testing.T) {
+	got, err := ListPending(t.TempDir())
+	require.NoError(t, err, "absent raw/ is not an error")
+	assert.Empty(t, got)
+}
+
+func TestListPendingReturnsOldestFirstWithExcerpt(t *testing.T) {
+	dir := t.TempDir()
+	writeRaw(t, dir, "2026-06-02-newer.md", "---\ncreated_at: 2026-06-02T00:00:00Z\n---\nNewer body here.\n")
+	writeRaw(t, dir, "2026-06-01-older.md", "---\ncreated_at: 2026-06-01T00:00:00Z\n---\nOlder body content.\n")
+	// non-md ignored
+	writeRaw(t, dir, "notes.txt", "ignore me")
+
+	got, err := ListPending(dir)
+	require.NoError(t, err)
+	require.Len(t, got, 2)
+	assert.Equal(t, "2026-06-01-older.md", got[0].Filename, "oldest first")
+	assert.Equal(t, "2026-06-02-newer.md", got[1].Filename)
+	assert.Contains(t, got[0].Excerpt, "Older body content")
+	assert.NotContains(t, got[0].Excerpt, "---", "excerpt is body, not frontmatter")
+	assert.Positive(t, got[0].SizeBytes)
+}
+
+func TestPromoteHappyPath(t *testing.T) {
+	dir := t.TempDir()
+	writeRaw(t, dir, "2026-06-01-lejpa-decision.md",
+		"---\ncreated_at: 2026-06-01T09:00:00Z\ncustom_field: keep-me\n---\n# LeJEPA\n\nbody.\n")
+
+	rel, err := PromoteNote(dir, PromoteOptions{
+		Filename: "2026-06-01-lejpa-decision.md", Wing: "jepa-fx", Hall: "decisions",
+	})
+	require.NoError(t, err)
+	assert.Equal(t, "wiki/jepa-fx/decisions/lejpa-decision.md", rel, "slug defaults to filename minus date prefix")
+
+	// Source deleted.
+	_, statErr := os.Stat(filepath.Join(dir, "raw", "2026-06-01-lejpa-decision.md"))
+	assert.True(t, os.IsNotExist(statErr), "source removed after promote")
+
+	got, err := os.ReadFile(filepath.Join(dir, filepath.FromSlash(rel)))
+	require.NoError(t, err)
+	s := string(got)
+	assert.Contains(t, s, "wing: jepa-fx")
+	assert.Contains(t, s, "hall: decisions")
+	assert.Contains(t, s, "created_at: 2026-06-01T09:00:00Z", "original created_at preserved")
+	assert.Contains(t, s, "promoted_at:")
+	assert.Contains(t, s, "custom_field: keep-me", "custom frontmatter preserved")
+	assert.Contains(t, s, "# LeJEPA")
+}
+
+func TestPromoteExplicitSlug(t *testing.T) {
+	dir := t.TempDir()
+	writeRaw(t, dir, "2026-06-01-x.md", "body\n")
+	rel, err := PromoteNote(dir, PromoteOptions{Filename: "2026-06-01-x.md", Wing: "a", Hall: "facts", Slug: "custom-slug"})
+	require.NoError(t, err)
+	assert.Equal(t, "wiki/a/facts/custom-slug.md", rel)
+}
+
+func TestPromoteInvalidHallErrorsBeforeTouchingFS(t *testing.T) {
+	dir := t.TempDir()
+	writeRaw(t, dir, "2026-06-01-x.md", "body\n")
+	_, err := PromoteNote(dir, PromoteOptions{Filename: "2026-06-01-x.md", Wing: "a", Hall: "garbage"})
+	require.Error(t, err)
+	// Source untouched.
+	_, statErr := os.Stat(filepath.Join(dir, "raw", "2026-06-01-x.md"))
+	assert.NoError(t, statErr, "invalid hall must not delete or move the source")
+}
+
+func TestPromoteMissingSourceErrors(t *testing.T) {
+	_, err := PromoteNote(t.TempDir(), PromoteOptions{Filename: "ghost.md", Wing: "a", Hall: "facts"})
+	require.Error(t, err)
+}
+
+func TestPromoteSlugCollisionNoOverwrite(t *testing.T) {
+	dir := t.TempDir()
+	// Pre-existing target.
+	dest := filepath.Join(dir, "wiki", "a", "facts", "x.md")
+	require.NoError(t, os.MkdirAll(filepath.Dir(dest), 0o755))
+	require.NoError(t, os.WriteFile(dest, []byte("EXISTING\n"), 0o644))
+	writeRaw(t, dir, "2026-06-01-x.md", "NEW\n")
+
+	_, err := PromoteNote(dir, PromoteOptions{Filename: "2026-06-01-x.md", Wing: "a", Hall: "facts"})
+	require.Error(t, err, "collision must error, not overwrite")
+
+	got, _ := os.ReadFile(dest)
+	assert.Equal(t, "EXISTING\n", string(got), "target not overwritten")
+	_, statErr := os.Stat(filepath.Join(dir, "raw", "2026-06-01-x.md"))
+	assert.NoError(t, statErr, "source preserved on collision (atomic: no delete without write)")
+}
+
+func TestPromoteRejectsTraversalFilename(t *testing.T) {
+	_, err := PromoteNote(t.TempDir(), PromoteOptions{Filename: "../escape.md", Wing: "a", Hall: "facts"})
+	require.Error(t, err)
+}
+
+func TestPromoteRebuildsWingIndex(t *testing.T) {
+	dir := t.TempDir()
+	writeRaw(t, dir, "2026-06-01-x.md", "---\ntitle: X Note\n---\nbody\n")
+	_, err := PromoteNote(dir, PromoteOptions{Filename: "2026-06-01-x.md", Wing: "a", Hall: "facts"})
+	require.NoError(t, err)
+	idx, err := os.ReadFile(filepath.Join(dir, "wiki", "a", "_index.md"))
+	require.NoError(t, err, "wing _index regenerated")
+	assert.Contains(t, string(idx), "x", "promoted note appears in the index")
+}

ingestion/internal/audit/buffer.go

@@ -0,0 +1,167 @@
+package audit
+
+import (
+	"bufio"
+	"crypto/sha256"
+	"encoding/hex"
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"sync"
+
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capture"
+)
+
+// FileBuffer is a durable, restart-surviving audit buffer backed by a
+// JSONL file: one {id, entry} record per line. It is the internal/public
+// tier fallback when loki is unreachable. Confirm rewrites the file
+// without the confirmed record, so a record is cleared only after its
+// central write is confirmed.
+//
+// Access is serialised by a mutex; the buffer is low-throughput (only
+// written during a loki outage), so a whole-file rewrite on Confirm is
+// acceptable and keeps the on-disk format trivially correct.
+type FileBuffer struct {
+	path string
+	mu   sync.Mutex
+}
+
+type bufferLine struct {
+	ID    string              `json:"id"`
+	Entry capture.AuditEntry  `json:"entry"`
+}
+
+// NewFileBuffer returns a buffer backed by path. The parent directory is
+// created if needed. The file itself is created lazily on first Append.
+func NewFileBuffer(path string) (*FileBuffer, error) {
+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
+		return nil, fmt.Errorf("create buffer dir: %w", err)
+	}
+	return &FileBuffer{path: path}, nil
+}
+
+// Writable reports whether the buffer file can be appended to. It probes
+// by opening the file for append (creating it if absent) — the same
+// operation Append performs — so Reserve's check matches Append's reality.
+func (b *FileBuffer) Writable() error {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	f, err := os.OpenFile(b.path, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0o644)
+	if err != nil {
+		return err
+	}
+	return f.Close()
+}
+
+// Append durably writes one audit record. The ID is derived from the
+// content + timestamp so it is stable and unique per record.
+func (b *FileBuffer) Append(e capture.AuditEntry) error {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+
+	line := bufferLine{ID: recordID(e), Entry: e}
+	data, err := json.Marshal(line)
+	if err != nil {
+		return fmt.Errorf("marshal buffer line: %w", err)
+	}
+	f, err := os.OpenFile(b.path, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0o644)
+	if err != nil {
+		return err
+	}
+	defer func() { _ = f.Close() }()
+	if _, err := f.Write(append(data, '\n')); err != nil {
+		return err
+	}
+	return f.Sync()
+}
+
+// Pending reads all buffered records. A missing file means none.
+func (b *FileBuffer) Pending() ([]Buffered, error) {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	return b.readAllLocked()
+}
+
+func (b *FileBuffer) readAllLocked() ([]Buffered, error) {
+	f, err := os.Open(b.path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return nil, nil
+		}
+		return nil, err
+	}
+	defer func() { _ = f.Close() }()
+
+	var out []Buffered
+	sc := bufio.NewScanner(f)
+	sc.Buffer(make([]byte, 0, 64*1024), 1024*1024)
+	for sc.Scan() {
+		raw := sc.Bytes()
+		if len(raw) == 0 {
+			continue
+		}
+		var l bufferLine
+		if err := json.Unmarshal(raw, &l); err != nil {
+			return nil, fmt.Errorf("parse buffer line: %w", err)
+		}
+		out = append(out, Buffered(l))
+	}
+	return out, sc.Err()
+}
+
+// Confirm removes a single record after its central write is confirmed, by
+// rewriting the file without it. Unknown IDs are a no-op.
+func (b *FileBuffer) Confirm(id string) error {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+
+	all, err := b.readAllLocked()
+	if err != nil {
+		return err
+	}
+	tmp := b.path + ".tmp"
+	f, err := os.OpenFile(tmp, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0o644)
+	if err != nil {
+		return err
+	}
+	w := bufio.NewWriter(f)
+	kept := 0
+	for _, rec := range all {
+		if rec.ID == id {
+			continue
+		}
+		data, _ := json.Marshal(bufferLine(rec))
+		if _, err := w.Write(append(data, '\n')); err != nil {
+			_ = f.Close()
+			return err
+		}
+		kept++
+	}
+	if err := w.Flush(); err != nil {
+		_ = f.Close()
+		return err
+	}
+	if err := f.Sync(); err != nil {
+		_ = f.Close()
+		return err
+	}
+	if err := f.Close(); err != nil {
+		return err
+	}
+	// Empty buffer → remove the file entirely so Pending sees nothing.
+	if kept == 0 {
+		_ = os.Remove(tmp)
+		return os.Remove(b.path)
+	}
+	return os.Rename(tmp, b.path)
+}
+
+// recordID is a stable per-record identifier: sha256 of the principal,
+// timestamp, and item list. Distinct captures never collide; the same
+// buffered record always hashes the same.
+func recordID(e capture.AuditEntry) string {
+	h := sha256.New()
+	_, _ = fmt.Fprintf(h, "%s|%s|%v|%s", e.Principal, e.Timestamp.UTC().Format("2006-01-02T15:04:05.000000000Z07:00"), e.Items, e.SessionRef)
+	return hex.EncodeToString(h.Sum(nil))[:16]
+}

ingestion/internal/audit/degrading.go

@@ -0,0 +1,96 @@
+package audit
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capture"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/classification"
+)
+
+// Central is the central audit substrate (loki). Ready is a cheap
+// reachability probe used by the pre-write reserve; Push writes a record.
+type Central interface {
+	Ready(ctx context.Context) error
+	Push(ctx context.Context, e capture.AuditEntry) error
+}
+
+// Buffer is the durable local fallback for internal/public-tier records
+// when the central sink is unreachable. It must survive process restart.
+type Buffer interface {
+	// Writable reports whether the buffer can currently be appended to.
+	Writable() error
+	Append(e capture.AuditEntry) error
+	// Pending returns buffered records awaiting reconciliation, each with a
+	// stable ID used to Confirm (delete) it after a confirmed central write.
+	Pending() ([]Buffered, error)
+	Confirm(id string) error
+}
+
+// Buffered is a buffered audit record plus its stable buffer ID.
+type Buffered struct {
+	ID    string
+	Entry capture.AuditEntry
+}
+
+// Notifier raises an out-of-band alert (ntfy) about a degraded state.
+type Notifier interface {
+	Notify(ctx context.Context, msg string) error
+}
+
+// DegradingSink is the classification-aware AuditSink (§4.4):
+//
+//   - central reachable → AuditCentral (all tiers).
+//   - central down + confidential → refuse (no buffer): confidential must
+//     be centrally auditable at write time.
+//   - central down + internal/public + buffer writable → AuditBuffered.
+//   - central down + (confidential, or buffer not writable) → refuse (floor).
+//
+// The decision is made in Reserve, before any write; Record then executes it.
+type DegradingSink struct {
+	central  Central
+	buffer   Buffer
+	notifier Notifier
+}
+
+// NewDegradingSink wires the central sink, durable buffer, and notifier.
+func NewDegradingSink(central Central, buffer Buffer, notifier Notifier) *DegradingSink {
+	return &DegradingSink{central: central, buffer: buffer, notifier: notifier}
+}
+
+// Reserve decides, before any write, how the capture will be audited — or
+// returns an error to refuse it.
+func (d *DegradingSink) Reserve(ctx context.Context, level classification.Level) (capture.AuditOutcome, error) {
+	if err := d.central.Ready(ctx); err == nil {
+		return capture.AuditCentral, nil
+	}
+	// Central sink is down.
+	if level == classification.Confidential {
+		return 0, fmt.Errorf("confidential capture requires the central audit sink, which is unreachable")
+	}
+	if err := d.buffer.Writable(); err != nil {
+		// Floor: neither central nor local buffer can record the audit.
+		return 0, fmt.Errorf("audit floor: central sink down and local buffer unwritable: %w", err)
+	}
+	return capture.AuditBuffered, nil
+}
+
+// Record persists the entry per the reserved outcome. For AuditBuffered it
+// also fires the degraded-state alert.
+func (d *DegradingSink) Record(ctx context.Context, e capture.AuditEntry, outcome capture.AuditOutcome) error {
+	switch outcome {
+	case capture.AuditBuffered:
+		if err := d.buffer.Append(e); err != nil {
+			return fmt.Errorf("buffer audit record: %w", err)
+		}
+		// Best-effort alert; the record is already durably buffered.
+		if d.notifier != nil {
+			_ = d.notifier.Notify(ctx, fmt.Sprintf(
+				"capture audit BUFFERED LOCALLY (loki unreachable) — principal=%s class=%s items=%d",
+				e.Principal, e.EffectiveClassification, len(e.Items)))
+		}
+		return nil
+	default:
+		return d.central.Push(ctx, e)
+	}
+}

ingestion/internal/audit/degrading_test.go

@@ -0,0 +1,191 @@
+package audit_test
+
+import (
+	"context"
+	"errors"
+	"path/filepath"
+	"testing"
+
+	"github.com/mathiasbq/hyperguild/ingestion/internal/audit"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capture"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/classification"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// --- fakes ---
+
+type fakeCentral struct {
+	down    bool
+	pushed  []capture.AuditEntry
+	pushErr error
+}
+
+func (f *fakeCentral) Ready(context.Context) error {
+	if f.down {
+		return errors.New("loki down")
+	}
+	return nil
+}
+
+func (f *fakeCentral) Push(_ context.Context, e capture.AuditEntry) error {
+	if f.pushErr != nil {
+		return f.pushErr
+	}
+	f.pushed = append(f.pushed, e)
+	return nil
+}
+
+type fakeNotifier struct{ msgs []string }
+
+func (f *fakeNotifier) Notify(_ context.Context, msg string) error {
+	f.msgs = append(f.msgs, msg)
+	return nil
+}
+
+// unwritableBuffer always reports it cannot be written (floor condition).
+type unwritableBuffer struct{}
+
+func (unwritableBuffer) Writable() error                       { return errors.New("disk full") }
+func (unwritableBuffer) Append(capture.AuditEntry) error       { return errors.New("disk full") }
+func (unwritableBuffer) Pending() ([]audit.Buffered, error)    { return nil, nil }
+func (unwritableBuffer) Confirm(string) error                  { return nil }
+
+func newFileBuffer(t *testing.T) *audit.FileBuffer {
+	t.Helper()
+	b, err := audit.NewFileBuffer(filepath.Join(t.TempDir(), "audit-buffer.jsonl"))
+	require.NoError(t, err)
+	return b
+}
+
+func entry(principal string) capture.AuditEntry {
+	return capture.AuditEntry{Principal: principal, EffectiveClassification: "internal", Items: []string{"insight:x"}}
+}
+
+// --- Reserve: classification-aware decision ---
+
+func TestReserveCentralUpGrantsCentral(t *testing.T) {
+	d := audit.NewDegradingSink(&fakeCentral{}, newFileBuffer(t), &fakeNotifier{})
+	for _, lvl := range []classification.Level{classification.Public, classification.Internal, classification.Confidential} {
+		out, err := d.Reserve(context.Background(), lvl)
+		require.NoError(t, err)
+		assert.Equal(t, capture.AuditCentral, out)
+	}
+}
+
+func TestReserveConfidentialSinkDownRefuses(t *testing.T) {
+	d := audit.NewDegradingSink(&fakeCentral{down: true}, newFileBuffer(t), &fakeNotifier{})
+	_, err := d.Reserve(context.Background(), classification.Confidential)
+	require.Error(t, err, "confidential + sink down → refuse, no buffer")
+}
+
+func TestReserveInternalSinkDownBuffers(t *testing.T) {
+	d := audit.NewDegradingSink(&fakeCentral{down: true}, newFileBuffer(t), &fakeNotifier{})
+	out, err := d.Reserve(context.Background(), classification.Internal)
+	require.NoError(t, err)
+	assert.Equal(t, capture.AuditBuffered, out)
+}
+
+func TestReserveFloorRefusesWhenNothingCanRecord(t *testing.T) {
+	d := audit.NewDegradingSink(&fakeCentral{down: true}, unwritableBuffer{}, &fakeNotifier{})
+	_, err := d.Reserve(context.Background(), classification.Internal)
+	require.Error(t, err, "central down AND buffer unwritable → floor refuse")
+}
+
+// --- Record: executes the reserved outcome ---
+
+func TestRecordCentralPushes(t *testing.T) {
+	c := &fakeCentral{}
+	d := audit.NewDegradingSink(c, newFileBuffer(t), &fakeNotifier{})
+	require.NoError(t, d.Record(context.Background(), entry("p"), capture.AuditCentral))
+	assert.Len(t, c.pushed, 1)
+}
+
+func TestRecordBufferedAppendsAndNotifies(t *testing.T) {
+	buf := newFileBuffer(t)
+	nt := &fakeNotifier{}
+	d := audit.NewDegradingSink(&fakeCentral{down: true}, buf, nt)
+	require.NoError(t, d.Record(context.Background(), entry("p"), capture.AuditBuffered))
+
+	pending, err := buf.Pending()
+	require.NoError(t, err)
+	assert.Len(t, pending, 1)
+	assert.NotEmpty(t, nt.msgs, "degraded state alerts via ntfy")
+}
+
+// --- FileBuffer durability + Confirm ---
+
+func TestFileBufferSurvivesRestart(t *testing.T) {
+	path := filepath.Join(t.TempDir(), "buf.jsonl")
+	b1, err := audit.NewFileBuffer(path)
+	require.NoError(t, err)
+	require.NoError(t, b1.Append(entry("p1")))
+	require.NoError(t, b1.Append(entry("p2")))
+
+	// "restart": a fresh FileBuffer over the same file sees the records.
+	b2, err := audit.NewFileBuffer(path)
+	require.NoError(t, err)
+	pending, err := b2.Pending()
+	require.NoError(t, err)
+	assert.Len(t, pending, 2)
+}
+
+func TestFileBufferConfirmRemovesOnlyThatRecord(t *testing.T) {
+	buf := newFileBuffer(t)
+	require.NoError(t, buf.Append(entry("keep")))
+	require.NoError(t, buf.Append(entry("drop")))
+
+	pending, _ := buf.Pending()
+	require.Len(t, pending, 2)
+	var dropID string
+	for _, p := range pending {
+		if p.Entry.Principal == "drop" {
+			dropID = p.ID
+		}
+	}
+	require.NoError(t, buf.Confirm(dropID))
+
+	after, _ := buf.Pending()
+	require.Len(t, after, 1)
+	assert.Equal(t, "keep", after[0].Entry.Principal)
+}
+
+// --- Reconcile ---
+
+func TestReconcileReplaysAndClearsOnlyAfterConfirmedWrite(t *testing.T) {
+	buf := newFileBuffer(t)
+	require.NoError(t, buf.Append(entry("a")))
+	require.NoError(t, buf.Append(entry("b")))
+	c := &fakeCentral{} // up
+	nt := &fakeNotifier{}
+
+	n, err := audit.Reconcile(context.Background(), c, buf, nt)
+	require.NoError(t, err)
+	assert.Equal(t, 2, n)
+	assert.Len(t, c.pushed, 2, "buffered records replayed to central")
+
+	pending, _ := buf.Pending()
+	assert.Empty(t, pending, "buffer cleared after confirmed central writes")
+}
+
+func TestReconcileNoopWhenCentralDown(t *testing.T) {
+	buf := newFileBuffer(t)
+	require.NoError(t, buf.Append(entry("a")))
+	n, err := audit.Reconcile(context.Background(), &fakeCentral{down: true}, buf, &fakeNotifier{})
+	require.NoError(t, err)
+	assert.Equal(t, 0, n)
+	pending, _ := buf.Pending()
+	assert.Len(t, pending, 1, "records stay buffered while central is down")
+}
+
+func TestReconcileKeepsRecordWhenPushFails(t *testing.T) {
+	buf := newFileBuffer(t)
+	require.NoError(t, buf.Append(entry("a")))
+	// Ready ok but Push fails → record must remain buffered (not lost).
+	c := &fakeCentral{pushErr: errors.New("push rejected")}
+	n, err := audit.Reconcile(context.Background(), c, buf, &fakeNotifier{})
+	require.NoError(t, err)
+	assert.Equal(t, 0, n)
+	pending, _ := buf.Pending()
+	assert.Len(t, pending, 1)
+}

ingestion/internal/audit/loki.go

@@ -0,0 +1,99 @@
+package audit
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capture"
+)
+
+// LokiCentral pushes capture audit records to a Grafana Loki instance via
+// its push API, and probes readiness via /ready. It is the central audit
+// substrate behind DegradingSink.
+type LokiCentral struct {
+	baseURL string
+	labels  map[string]string
+	http    *http.Client
+}
+
+// NewLokiCentral constructs a LokiCentral for the given base URL (e.g.
+// http://loki:3100). Returns nil when baseURL is empty so callers can
+// treat missing config as "no central sink" with a single nil check.
+func NewLokiCentral(baseURL string) *LokiCentral {
+	if baseURL == "" {
+		return nil
+	}
+	return &LokiCentral{
+		baseURL: strings.TrimRight(baseURL, "/"),
+		labels:  map[string]string{"service": "brain-capture", "kind": "audit"},
+		http:    &http.Client{Timeout: 10 * time.Second},
+	}
+}
+
+// Ready probes Loki's readiness endpoint.
+func (l *LokiCentral) Ready(ctx context.Context) error {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, l.baseURL+"/ready", nil)
+	if err != nil {
+		return err
+	}
+	resp, err := l.http.Do(req)
+	if err != nil {
+		return fmt.Errorf("loki not ready: %w", err)
+	}
+	defer func() { _ = resp.Body.Close() }()
+	if resp.StatusCode != http.StatusOK {
+		return fmt.Errorf("loki not ready: status %d", resp.StatusCode)
+	}
+	return nil
+}
+
+// pushPayload is the Loki push API body: one stream, one entry whose line
+// is the JSON-encoded audit record.
+type pushPayload struct {
+	Streams []lokiStream `json:"streams"`
+}
+
+type lokiStream struct {
+	Stream map[string]string `json:"stream"`
+	Values [][2]string       `json:"values"`
+}
+
+// Push writes one audit record to Loki as a structured log line.
+func (l *LokiCentral) Push(ctx context.Context, e capture.AuditEntry) error {
+	line, err := json.Marshal(e)
+	if err != nil {
+		return fmt.Errorf("marshal audit entry: %w", err)
+	}
+	ts := e.Timestamp
+	if ts.IsZero() {
+		ts = time.Now()
+	}
+	body, err := json.Marshal(pushPayload{Streams: []lokiStream{{
+		Stream: l.labels,
+		Values: [][2]string{{strconv.FormatInt(ts.UTC().UnixNano(), 10), string(line)}},
+	}}})
+	if err != nil {
+		return err
+	}
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost,
+		l.baseURL+"/loki/api/v1/push", bytes.NewReader(body))
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	resp, err := l.http.Do(req)
+	if err != nil {
+		return fmt.Errorf("loki push: %w", err)
+	}
+	defer func() { _ = resp.Body.Close() }()
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		return fmt.Errorf("loki push: status %d", resp.StatusCode)
+	}
+	return nil
+}

ingestion/internal/audit/loki_ntfy_test.go

@@ -0,0 +1,86 @@
+package audit_test
+
+import (
+	"context"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/mathiasbq/hyperguild/ingestion/internal/audit"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capture"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestLokiReadyAndPush(t *testing.T) {
+	var pushBody string
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.URL.Path {
+		case "/ready":
+			w.WriteHeader(http.StatusOK)
+		case "/loki/api/v1/push":
+			b, _ := io.ReadAll(r.Body)
+			pushBody = string(b)
+			w.WriteHeader(http.StatusNoContent)
+		default:
+			w.WriteHeader(http.StatusNotFound)
+		}
+	}))
+	defer srv.Close()
+
+	c := audit.NewLokiCentral(srv.URL)
+	require.NotNil(t, c)
+	require.NoError(t, c.Ready(context.Background()))
+
+	err := c.Push(context.Background(), capture.AuditEntry{
+		Principal: "koala-cli", EffectiveClassification: "internal", Items: []string{"insight:x"},
+	})
+	require.NoError(t, err)
+	assert.Contains(t, pushBody, "streams")
+	assert.Contains(t, pushBody, "koala-cli", "audit entry serialised into the loki line")
+}
+
+func TestLokiReadyFailsWhenDown(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		w.WriteHeader(http.StatusServiceUnavailable)
+	}))
+	defer srv.Close()
+	require.Error(t, audit.NewLokiCentral(srv.URL).Ready(context.Background()))
+}
+
+func TestLokiNilWhenUnconfigured(t *testing.T) {
+	assert.Nil(t, audit.NewLokiCentral(""))
+}
+
+func TestNtfyNotify(t *testing.T) {
+	var gotBody, gotAuth string
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		b, _ := io.ReadAll(r.Body)
+		gotBody = string(b)
+		gotAuth = r.Header.Get("Authorization")
+		w.WriteHeader(http.StatusOK)
+	}))
+	defer srv.Close()
+
+	n := audit.NewNtfyNotifier(srv.URL, "ntfy-token")
+	require.NotNil(t, n)
+	require.NoError(t, n.Notify(context.Background(), "audit buffered locally"))
+	assert.Contains(t, gotBody, "audit buffered locally")
+	assert.Equal(t, "Bearer ntfy-token", gotAuth)
+}
+
+func TestNtfyDoesNotLeakTokenOnError(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		w.WriteHeader(http.StatusInternalServerError)
+	}))
+	defer srv.Close()
+	err := audit.NewNtfyNotifier(srv.URL, "secret-token").Notify(context.Background(), "x")
+	require.Error(t, err)
+	assert.False(t, strings.Contains(err.Error(), "secret-token"), "token must not leak into errors")
+}
+
+func TestNtfyNilWhenUnconfigured(t *testing.T) {
+	assert.Nil(t, audit.NewNtfyNotifier("", "tok"))
+}

ingestion/internal/audit/ntfy.go

@@ -0,0 +1,55 @@
+package audit
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"strings"
+	"time"
+)
+
+// NtfyNotifier posts alerts to an ntfy topic URL. Used to surface a
+// degraded audit state (records buffered locally during a loki outage).
+type NtfyNotifier struct {
+	topicURL string
+	token    string
+	http     *http.Client
+}
+
+// NewNtfyNotifier constructs a notifier for the given ntfy topic URL
+// (e.g. https://ntfy.sh/my-topic). token is an optional bearer for
+// protected ntfy instances; it is held here and only sent in the
+// Authorization header, never logged. Returns nil when topicURL is empty.
+func NewNtfyNotifier(topicURL, token string) *NtfyNotifier {
+	if topicURL == "" {
+		return nil
+	}
+	return &NtfyNotifier{
+		topicURL: strings.TrimRight(topicURL, "/"),
+		token:    token,
+		http:     &http.Client{Timeout: 10 * time.Second},
+	}
+}
+
+// Notify posts a message to the ntfy topic.
+func (n *NtfyNotifier) Notify(ctx context.Context, msg string) error {
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, n.topicURL, strings.NewReader(msg))
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Title", "brain-capture audit degraded")
+	req.Header.Set("Priority", "high")
+	req.Header.Set("Tags", "warning,brain")
+	if n.token != "" {
+		req.Header.Set("Authorization", "Bearer "+n.token)
+	}
+	resp, err := n.http.Do(req)
+	if err != nil {
+		return fmt.Errorf("ntfy notify: %w", err)
+	}
+	defer func() { _ = resp.Body.Close() }()
+	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
+		return fmt.Errorf("ntfy notify: status %d", resp.StatusCode)
+	}
+	return nil
+}

ingestion/internal/audit/reconcile.go

@@ -0,0 +1,65 @@
+package audit
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+	"time"
+)
+
+// Reconcile replays locally-buffered audit records to the central sink
+// when it is reachable again. A record is removed from the buffer ONLY
+// after its central write is confirmed, so a crash mid-reconcile re-plays
+// rather than loses. Returns the number of records reconciled.
+//
+// A no-op (0, nil) when the central sink is still unreachable or the
+// buffer is empty.
+func Reconcile(ctx context.Context, central Central, buffer Buffer, notifier Notifier) (int, error) {
+	if err := central.Ready(ctx); err != nil {
+		return 0, nil // still down; try again next tick
+	}
+	pending, err := buffer.Pending()
+	if err != nil {
+		return 0, fmt.Errorf("read buffer: %w", err)
+	}
+	reconciled := 0
+	for _, rec := range pending {
+		if err := central.Push(ctx, rec.Entry); err != nil {
+			// Central went away mid-drain; stop and keep the rest buffered.
+			break
+		}
+		if err := buffer.Confirm(rec.ID); err != nil {
+			return reconciled, fmt.Errorf("confirm buffered record %s: %w", rec.ID, err)
+		}
+		reconciled++
+	}
+	if reconciled > 0 && notifier != nil {
+		_ = notifier.Notify(ctx, fmt.Sprintf("reconciled %d buffered capture audit record(s) to loki", reconciled))
+	}
+	return reconciled, nil
+}
+
+// StartReconcile runs Reconcile on a ticker until ctx is cancelled. It is
+// the recovery half of the degrade-and-buffer path; pair it with a
+// DegradingSink sharing the same buffer + central.
+func StartReconcile(ctx context.Context, central Central, buffer Buffer, notifier Notifier, interval time.Duration) {
+	if interval <= 0 {
+		interval = time.Minute
+	}
+	go func() {
+		t := time.NewTicker(interval)
+		defer t.Stop()
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			case <-t.C:
+				if n, err := Reconcile(ctx, central, buffer, notifier); err != nil {
+					slog.Warn("audit reconcile failed", "err", err)
+				} else if n > 0 {
+					slog.Info("audit reconcile", "reconciled", n)
+				}
+			}
+		}
+	}()
+}

ingestion/internal/audit/slog.go

@@ -0,0 +1,56 @@
+// Package audit provides AuditSink implementations for the capture
+// capability (I5). This file ships the minimal slog-backed sink used in
+// #53: it emits the request-level audit record to structured logs, which
+// the alloy/loki substrate already scrapes. The classification-aware
+// degradation/refusal sink (confidential fails closed, internal buffers +
+// reconciles) lands in #54 and replaces this behind the same interface.
+package audit
+
+import (
+	"context"
+	"log/slog"
+
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capture"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/classification"
+)
+
+// SlogSink records audit entries to an slog.Logger. It never fails and is
+// always centrally available, so its Reserve always grants AuditCentral —
+// it does not exercise the I5 degradation/floor. That is DegradingSink's
+// job (loki + durable buffer). SlogSink is the default for deployments
+// without a loki endpoint configured. A nil logger ⇒ slog.Default().
+type SlogSink struct {
+	logger *slog.Logger
+}
+
+// NewSlogSink constructs a SlogSink. nil logger ⇒ slog.Default().
+func NewSlogSink(logger *slog.Logger) *SlogSink {
+	if logger == nil {
+		logger = slog.Default()
+	}
+	return &SlogSink{logger: logger}
+}
+
+// Reserve always grants central recording — slog is always available.
+func (s *SlogSink) Reserve(_ context.Context, _ classification.Level) (capture.AuditOutcome, error) {
+	return capture.AuditCentral, nil
+}
+
+// Record emits the audit entry at info level. Security events, when
+// present, are logged at warn level so they surface independently of the
+// routine audit stream.
+func (s *SlogSink) Record(_ context.Context, e capture.AuditEntry, _ capture.AuditOutcome) error {
+	s.logger.Info("capture audit",
+		"principal", e.Principal,
+		"actor", e.Actor,
+		"harness", e.Harness,
+		"session_ref", e.SessionRef,
+		"classification", e.EffectiveClassification,
+		"items", e.Items,
+		"ts", e.Timestamp,
+	)
+	for _, ev := range e.SecurityEvents {
+		s.logger.Warn("capture security event", "principal", e.Principal, "event", ev)
+	}
+	return nil
+}

ingestion/internal/audit/slog_test.go

@@ -0,0 +1,41 @@
+package audit_test
+
+import (
+	"bytes"
+	"context"
+	"log/slog"
+	"testing"
+
+	"github.com/mathiasbq/hyperguild/ingestion/internal/audit"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capture"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestSlogSinkRecordsEntryAndSecurityEvents(t *testing.T) {
+	var buf bytes.Buffer
+	sink := audit.NewSlogSink(slog.New(slog.NewTextHandler(&buf, nil)))
+
+	err := sink.Record(context.Background(), capture.AuditEntry{
+		Principal:               "koala-cli",
+		Harness:                 "claude-code",
+		EffectiveClassification: "confidential",
+		Items:                   []string{"insight:wiki/a/facts/x.md"},
+		SecurityEvents:          []string{"asserted-vs-derived origin mismatch"},
+	}, capture.AuditCentral)
+	require.NoError(t, err)
+
+	out := buf.String()
+	assert.Contains(t, out, "capture audit")
+	assert.Contains(t, out, "koala-cli")
+	assert.Contains(t, out, "confidential")
+	assert.Contains(t, out, "capture security event")
+	assert.Contains(t, out, "asserted-vs-derived origin mismatch")
+}
+
+func TestSlogSinkNilLoggerDefaults(t *testing.T) {
+	// nil logger must not panic.
+	require.NotPanics(t, func() {
+		_ = audit.NewSlogSink(nil).Record(context.Background(), capture.AuditEntry{}, capture.AuditCentral)
+	})
+}

ingestion/internal/brainstore/store.go

@@ -0,0 +1,129 @@
+// Package brainstore is the concrete BrainStore: the single shared
+// implementation of the #45 write/update/get verbs, used by BOTH the MCP
+// handlers and the capture use-case so there is one implementation, not
+// two (the Clean-Architecture / DRY payoff of #51).
+//
+// It composes the file-level primitives in package api (WriteNote,
+// UpdateNote, ReadNote — the read-after-write contract) with the wiki
+// upkeep that must accompany a write: wing _index rebuild, cross-wing
+// auto-tunnel, and graph re-index. Embedding refresh is intentionally
+// out-of-band (mtime-driven vectorstore.Sync) and not triggered here —
+// see the brain note on out-of-band sync.
+package brainstore
+
+import (
+	"context"
+	"log/slog"
+	"strings"
+
+	"github.com/mathiasbq/hyperguild/ingestion/internal/api"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/brain"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capture"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/graphsync"
+)
+
+// Store implements capture.BrainStore against a brain directory on disk,
+// optionally re-indexing each write into the knowledge graph.
+type Store struct {
+	brainDir string
+	graph    graphsync.Store // nil = graph re-index disabled
+}
+
+// New constructs a Store bound to brainDir with graph indexing disabled.
+func New(brainDir string) *Store {
+	return &Store{brainDir: brainDir}
+}
+
+// WithGraph enables graph re-index on every write/update. nil disables it.
+func (s *Store) WithGraph(g graphsync.Store) *Store {
+	s.graph = g
+	return s
+}
+
+// Write creates a brain note and returns its read-after-write handle.
+func (s *Store) Write(ctx context.Context, n capture.Note) (capture.Ref, error) {
+	relPath, err := api.WriteNote(s.brainDir, api.WriteNoteOptions{
+		Content:  n.Content,
+		Filename: n.Filename,
+		Type:     n.Type,
+		Domain:   n.Domain,
+		Wing:     n.Wing,
+		Hall:     n.Hall,
+	})
+	if err != nil {
+		return capture.Ref{}, err
+	}
+	s.wikiUpkeep(relPath, n.Wing, n.Content)
+	s.indexInGraph(ctx, "brain_write", relPath)
+
+	_, _, hash, _ := api.ReadNote(s.brainDir, relPath)
+	return capture.Ref{ID: relPath, Path: relPath, ContentHash: hash}, nil
+}
+
+// Update supersedes an existing note in place. slug may be a bare slug
+// (resolved against n.Wing/n.Hall) or a full brain-relative path (when it
+// contains a slash). It never creates — a missing target is an error.
+func (s *Store) Update(ctx context.Context, slug string, n capture.Note) (capture.Ref, error) {
+	opts := api.UpdateNoteOptions{Content: n.Content, Reason: n.Reason}
+	if strings.Contains(slug, "/") {
+		opts.Path = slug
+	} else {
+		opts.Wing, opts.Hall, opts.Slug = n.Wing, n.Hall, slug
+	}
+
+	relPath, hash, _, err := api.UpdateNote(s.brainDir, opts)
+	if err != nil {
+		return capture.Ref{}, err
+	}
+	if wing := wingFromRelPath(relPath); wing != "" {
+		s.wikiUpkeep(relPath, wing, n.Content)
+	}
+	s.indexInGraph(ctx, "brain_update", relPath)
+
+	return capture.Ref{ID: relPath, Path: relPath, ContentHash: hash, Superseded: true}, nil
+}
+
+// Get fetches a note by id/path — the read-after-write confirmation
+// primitive (a direct fetch, never a semantic query).
+func (s *Store) Get(_ context.Context, id string) (capture.StoredNote, error) {
+	fm, body, hash, err := api.ReadNote(s.brainDir, id)
+	if err != nil {
+		return capture.StoredNote{}, err
+	}
+	return capture.StoredNote{ID: id, Path: id, ContentHash: hash, Frontmatter: fm, Body: body}, nil
+}
+
+// wikiUpkeep rebuilds the wing _index and re-tunnels cross-wing matches
+// when a note lands in the structured wiki. Both are best-effort: the
+// note is already written, so a failure here is logged, not propagated.
+func (s *Store) wikiUpkeep(relPath, wing, content string) {
+	if wing == "" {
+		return
+	}
+	if err := brain.BuildWingIndex(s.brainDir, wing); err != nil {
+		slog.Warn("brainstore: auto-index failed", "wing", wing, "err", err)
+	}
+	if err := brain.AutoTunnel(s.brainDir, relPath, content); err != nil {
+		slog.Warn("brainstore: auto-tunnel failed", "src", relPath, "err", err)
+	}
+}
+
+// indexInGraph re-indexes a written doc into the graph, best-effort.
+func (s *Store) indexInGraph(ctx context.Context, op, relPath string) {
+	if s.graph == nil || relPath == "" {
+		return
+	}
+	if err := graphsync.IndexDoc(ctx, s.graph, s.brainDir, relPath); err != nil {
+		slog.Warn(op+": graph index failed", "path", relPath, "err", err)
+	}
+}
+
+// wingFromRelPath extracts the wing from a structured wiki path
+// (wiki/<wing>/<hall>/<slug>.md). Returns "" for legacy/non-wiki paths.
+func wingFromRelPath(relPath string) string {
+	parts := strings.Split(relPath, "/")
+	if len(parts) >= 4 && parts[0] == "wiki" {
+		return parts[1]
+	}
+	return ""
+}

ingestion/internal/brainstore/store_test.go

@@ -0,0 +1,85 @@
+package brainstore_test
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/mathiasbq/hyperguild/ingestion/internal/brainstore"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capture"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestStoreWriteReturnsHandle(t *testing.T) {
+	dir := t.TempDir()
+	s := brainstore.New(dir)
+
+	ref, err := s.Write(context.Background(), capture.Note{
+		Content: "# X\n\nbody\n", Filename: "x", Wing: "a", Hall: "facts",
+	})
+	require.NoError(t, err)
+	assert.Equal(t, "wiki/a/facts/x.md", ref.Path)
+	assert.Equal(t, ref.Path, ref.ID)
+	assert.NotEmpty(t, ref.ContentHash)
+	assert.False(t, ref.Superseded)
+
+	_, err = os.Stat(filepath.Join(dir, "wiki/a/facts/x.md"))
+	require.NoError(t, err)
+}
+
+func TestStoreUpdateSupersedes(t *testing.T) {
+	dir := t.TempDir()
+	s := brainstore.New(dir)
+	_, err := s.Write(context.Background(), capture.Note{
+		Content: "old\n", Filename: "n", Wing: "a", Hall: "facts",
+	})
+	require.NoError(t, err)
+
+	ref, err := s.Update(context.Background(), "n", capture.Note{
+		Content: "new\n", Wing: "a", Hall: "facts", Reason: "changed",
+	})
+	require.NoError(t, err)
+	assert.True(t, ref.Superseded)
+	assert.Equal(t, "wiki/a/facts/n.md", ref.Path)
+
+	got, _ := os.ReadFile(filepath.Join(dir, "wiki/a/facts/n.md"))
+	assert.Contains(t, string(got), "new")
+	assert.Contains(t, string(got), "supersede_reason: changed")
+}
+
+func TestStoreUpdateByFullPath(t *testing.T) {
+	dir := t.TempDir()
+	s := brainstore.New(dir)
+	_, err := s.Write(context.Background(), capture.Note{Content: "old\n", Filename: "n", Wing: "a", Hall: "facts"})
+	require.NoError(t, err)
+
+	ref, err := s.Update(context.Background(), "wiki/a/facts/n.md", capture.Note{Content: "fresh\n"})
+	require.NoError(t, err)
+	assert.Equal(t, "wiki/a/facts/n.md", ref.Path)
+}
+
+func TestStoreUpdateMissingErrors(t *testing.T) {
+	dir := t.TempDir()
+	s := brainstore.New(dir)
+	_, err := s.Update(context.Background(), "ghost", capture.Note{Content: "x\n", Wing: "a", Hall: "facts"})
+	require.Error(t, err)
+	_, statErr := os.Stat(filepath.Join(dir, "wiki/a/facts/ghost.md"))
+	assert.True(t, os.IsNotExist(statErr), "update must not create")
+}
+
+func TestStoreGetRoundTripsHash(t *testing.T) {
+	dir := t.TempDir()
+	s := brainstore.New(dir)
+	ref, err := s.Write(context.Background(), capture.Note{
+		Content: "# Body\n\ntext\n", Filename: "n", Wing: "a", Hall: "facts",
+	})
+	require.NoError(t, err)
+
+	note, err := s.Get(context.Background(), ref.ID)
+	require.NoError(t, err)
+	assert.Equal(t, ref.ContentHash, note.ContentHash, "write→get hash round-trips")
+	assert.Equal(t, "a", note.Frontmatter["wing"])
+	assert.Contains(t, note.Body, "# Body")
+}

ingestion/internal/capture/entities.go

@@ -0,0 +1,148 @@
+// Package capture is the Clean-Architecture use-case for the uniform
+// capture capability (issue #49/#51): persist a finished session's
+// valuable output — insights → brain, action items → Gitea tickets,
+// optional summary → ai-sessions — with one invocation, identical core
+// behaviour across every harness.
+//
+// This package is pure orchestration. It depends only on ports
+// (interfaces) and plain entities — no HTTP, no live Gitea, no embedding
+// or audit I/O. The real adapters are wired in #52 (Gitea tracker), #53
+// (REST + I1 origin gate), and #54/#55 (audit path + relay). The I1
+// sovereignty refusal and the classification-aware audit degradation are
+// deliberately NOT here — those need the server-derived principal origin
+// (#53) and the loki/buffer machinery (#54). What lives here is everything
+// testable against fakes: validation, effective-classification resolution
+// (stricter wins), best-effort orchestration, and the partial receipt.
+package capture
+
+// Zone is the trust zone a capture originates from, server-derived from
+// the authenticated principal (spec §4.2 / I1). It is NEVER taken from
+// caller input — context.Harness is descriptive telemetry only.
+type Zone int
+
+const (
+	// ZoneUnknown means the origin was not set. The REST adapter always
+	// sets a concrete zone; the service treats Unknown as "not gated" (only
+	// an explicit ZoneUSNexus triggers the I1 refusal) so the gate can
+	// never fire on a caller-controllable default.
+	ZoneUnknown Zone = iota
+	// ZoneSovereign is sovereign soil (homelab / Tailscale CLI callers).
+	ZoneSovereign
+	// ZoneUSNexus is a non-sovereign US-jurisdiction surface (e.g.
+	// claude.ai). Confidential captures through it are refused (I1).
+	ZoneUSNexus
+)
+
+// String renders the zone for audit/refusal messages.
+func (z Zone) String() string {
+	switch z {
+	case ZoneSovereign:
+		return "sovereign-soil"
+	case ZoneUSNexus:
+		return "us-nexus"
+	default:
+		return "unknown"
+	}
+}
+
+// CaptureContext is the per-session metadata accompanying a capture.
+//
+// Classification is the caller-declared sensitivity (model C, spec §4.1):
+// the server independently derives the target's classification and gates
+// on the stricter of the two. Principal and Origin are server-derived from
+// the authenticated identity (the REST adapter populates them); they are
+// never caller-asserted. Harness is descriptive telemetry only — never a
+// gate input.
+type CaptureContext struct {
+	Harness        string
+	SessionRef     string
+	Fidelity       string
+	Actor          string
+	Classification string // caller-declared level token ("" = unspecified)
+	Principal      string // server-derived (auth); audit identity
+	Origin         Zone   // server-derived trust zone; the I1 gate input
+}
+
+// Insight is one piece of session knowledge bound for the brain. A
+// non-empty SupersedeSlug routes to Update (revise in place); otherwise
+// Write (create).
+type Insight struct {
+	Text          string
+	Wing          string
+	Hall          string
+	SupersedeSlug string
+}
+
+// Ticket is one action item bound for a Gitea repo. Owner is always the
+// operator (set by the tracker adapter), never carried here.
+type Ticket struct {
+	Repo   string
+	Action string // create | close | comment
+	Number int    // required for close/comment
+	Title  string // required for create
+	Body   string
+}
+
+// Summary is an optional session summary bound for ai-sessions.
+type Summary struct {
+	Title        string
+	Body         string
+	ReposTouched []string
+}
+
+// CaptureInput is the whole capture request.
+type CaptureInput struct {
+	Context  CaptureContext
+	Insights []Insight
+	Tickets  []Ticket
+	Summary  *Summary
+	DryRun   bool
+}
+
+// InsightResult is the per-insight outcome in the receipt.
+type InsightResult struct {
+	ID          string `json:"id,omitempty"`
+	Path        string `json:"path,omitempty"`
+	ContentHash string `json:"content_hash,omitempty"`
+	Superseded  bool   `json:"superseded"`
+	OK          bool   `json:"ok"`
+}
+
+// TicketResult is the per-ticket outcome in the receipt.
+type TicketResult struct {
+	Repo   string `json:"repo"`
+	Number int    `json:"number,omitempty"`
+	Action string `json:"action"`
+	URL    string `json:"url,omitempty"`
+	OK     bool   `json:"ok"`
+}
+
+// SummaryResult is the summary outcome in the receipt.
+type SummaryResult struct {
+	Path string `json:"path,omitempty"`
+	OK   bool   `json:"ok"`
+}
+
+// ItemError pins a failure to a specific request item for the partial
+// receipt. Item is a stable locator like "insight[1]" or "ticket[0]".
+type ItemError struct {
+	Item  string `json:"item"`
+	Error string `json:"error"`
+}
+
+// CaptureReceipt is the structured, partial-aware result. Per-item ok
+// flags plus a flat Errors list make partial success explicit; the
+// caller never has to infer what landed.
+type CaptureReceipt struct {
+	Insights                []InsightResult `json:"insights"`
+	Tickets                 []TicketResult  `json:"tickets"`
+	Summary                 *SummaryResult  `json:"summary,omitempty"`
+	Errors                  []ItemError     `json:"errors"`
+	EffectiveClassification string          `json:"effective_classification,omitempty"`
+	DryRun                  bool            `json:"dry_run"`
+	// AuditBuffered is true when the central audit sink was unreachable and
+	// this capture's audit record was written to the durable local buffer
+	// instead (internal/public tier). Surfaces the degraded state to the
+	// caller per §4.4.
+	AuditBuffered bool `json:"audit_buffered,omitempty"`
+}

ingestion/internal/capture/ports.go

@@ -0,0 +1,126 @@
+package capture
+
+import (
+	"context"
+	"time"
+
+	"github.com/mathiasbq/hyperguild/ingestion/internal/classification"
+)
+
+// Ref is the read-after-write handle returned by a brain write/update —
+// the #45 contract. ContentHash lets the caller confirm what landed
+// without a re-query; for an Update, Superseded is true.
+type Ref struct {
+	ID          string
+	Path        string
+	ContentHash string
+	Superseded  bool
+}
+
+// StoredNote is a brain note fetched by Get: the read-after-write
+// confirmation primitive (a direct fetch, never a semantic query).
+type StoredNote struct {
+	ID          string
+	Path        string
+	ContentHash string
+	Frontmatter map[string]string
+	Body        string
+}
+
+// Note is the brain-write payload. It carries both the wing/hall taxonomy
+// and the legacy type/domain fields so a single BrainStore serves both
+// capture insights and the existing MCP brain_write surface. Reason is
+// the supersede rationale, used only by Update.
+type Note struct {
+	Content  string
+	Filename string
+	Wing     string
+	Hall     string
+	Type     string
+	Domain   string
+	Reason   string
+}
+
+// BrainStore is the brain persistence port — the shared implementation of
+// the #45 write/update/get verbs that both the MCP handlers and capture
+// call, so there is one implementation, not two. The read-after-write +
+// staleness discipline lives behind this interface so no caller carries
+// the rule.
+type BrainStore interface {
+	Write(ctx context.Context, n Note) (Ref, error)
+	Update(ctx context.Context, slug string, n Note) (Ref, error)
+	Get(ctx context.Context, id string) (StoredNote, error)
+}
+
+// IssueRef identifies a ticket touched by the tracker.
+type IssueRef struct {
+	Repo   string
+	Number int
+	URL    string
+}
+
+// IssueTracker is the Gitea ticket port. The implementation (#52) always
+// scopes to owner "mathias"; the port deliberately omits owner.
+type IssueTracker interface {
+	CreateIssue(ctx context.Context, repo, title, body string) (IssueRef, error)
+	// CloseIssue closes an issue, optionally posting a closing comment
+	// first (empty comment ⇒ close only).
+	CloseIssue(ctx context.Context, repo string, number int, comment string) (IssueRef, error)
+	CommentIssue(ctx context.Context, repo string, number int, body string) (IssueRef, error)
+}
+
+// SummaryWriter is the ai-sessions summary port.
+type SummaryWriter interface {
+	WriteFile(ctx context.Context, repo, path, content string) error
+}
+
+// ClassificationPolicy derives a target's sensitivity (model C). The
+// "stricter wins" combination of declared vs derived is use-case policy
+// and lives in the service, so the port stays minimal. Satisfied by
+// classification.Config (#50).
+type ClassificationPolicy interface {
+	Derive(target classification.Target) classification.Level
+}
+
+// AuditEntry is the request-level audit record (I5): who/what captured
+// what, when, via which principal. SecurityEvents carries anomalies such
+// as a caller under-declaring sensitivity relative to the target floor.
+type AuditEntry struct {
+	Timestamp               time.Time
+	Principal               string
+	Actor                   string
+	Harness                 string
+	SessionRef              string
+	EffectiveClassification string
+	Items                   []string
+	SecurityEvents          []string
+}
+
+// AuditOutcome is how a capture's audit record was (or will be) persisted.
+type AuditOutcome int
+
+const (
+	// AuditCentral means the record goes to the central sink (loki).
+	AuditCentral AuditOutcome = iota
+	// AuditBuffered means the central sink was unreachable and the record
+	// is written to a durable local buffer for later reconciliation
+	// (internal/public tier only).
+	AuditBuffered
+)
+
+// AuditSink is the two-phase, classification-aware audit port (I5, §4.4).
+//
+// Reserve runs BEFORE any write and decides whether the capture can be
+// audited at its effective classification: it returns the outcome to use,
+// or an error to refuse the capture before anything is written
+// (confidential + central sink down → refuse; the all-tiers floor when
+// nothing can record → refuse). Record runs AFTER the writes and persists
+// the final entry per the reserved outcome.
+//
+// Splitting reserve from record is what lets "confidential + sink-down →
+// refuse before any write" be literally true while the record itself
+// (which lists what landed) is necessarily written afterwards.
+type AuditSink interface {
+	Reserve(ctx context.Context, level classification.Level) (AuditOutcome, error)
+	Record(ctx context.Context, e AuditEntry, outcome AuditOutcome) error
+}

ingestion/internal/capture/service.go

@@ -0,0 +1,388 @@
+package capture
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/hex"
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/mathiasbq/hyperguild/ingestion/internal/brain"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/classification"
+)
+
+// Service is the CaptureSession use-case. It depends only on ports.
+type Service struct {
+	brain     BrainStore
+	issues    IssueTracker
+	summaries SummaryWriter
+	policy    ClassificationPolicy
+	audit     AuditSink
+
+	// now is the clock, injectable for deterministic summary paths and
+	// audit timestamps in tests.
+	now func() time.Time
+}
+
+// NewService constructs a Service from its ports. summaries may be nil
+// when no summary persistence is wired; a CaptureInput with a Summary
+// then fails that item rather than panicking.
+func NewService(b BrainStore, tr IssueTracker, sw SummaryWriter, p ClassificationPolicy, a AuditSink) *Service {
+	return &Service{brain: b, issues: tr, summaries: sw, policy: p, audit: a, now: time.Now}
+}
+
+var validActions = map[string]bool{"create": true, "close": true, "comment": true}
+
+// ErrSovereigntyRefused is returned when the I1 gate refuses a capture
+// (confidential effective classification through a us-nexus origin). The
+// REST adapter maps it to HTTP 403. Callers test with errors.Is.
+var ErrSovereigntyRefused = fmt.Errorf("capture refused by I1 sovereignty gate")
+
+// ErrAuditUnavailable is returned when the I5 audit gate refuses a capture
+// before any write: a confidential capture whose central audit sink is
+// unreachable, or the all-tiers floor where nothing can record the audit.
+// The REST adapter maps it to HTTP 503. Callers test with errors.Is.
+var ErrAuditUnavailable = fmt.Errorf("capture refused: audit substrate unavailable")
+
+// assertedZoneMismatch returns a security-event string when the caller's
+// harness label asserts a trust zone that contradicts the server-derived
+// origin. A harness label that names no zone (the normal case, e.g.
+// "claude-code") returns "". The label is never used as a gate input —
+// this only flags the discrepancy for the audit trail.
+func assertedZoneMismatch(harness string, derived Zone) string {
+	var asserted Zone
+	switch strings.ToLower(strings.TrimSpace(harness)) {
+	case "sovereign-soil", "sovereign":
+		asserted = ZoneSovereign
+	case "us-nexus", "usnexus":
+		asserted = ZoneUSNexus
+	default:
+		return "" // no zone claim
+	}
+	if asserted != derived {
+		return fmt.Sprintf("asserted-vs-derived origin mismatch: harness asserted %s, principal resolves to %s",
+			asserted, derived)
+	}
+	return ""
+}
+
+// Capture runs the use-case: validate (fail-closed), resolve effective
+// classification (stricter of declared vs target-derived), then persist
+// insights → tickets → summary best-effort, emit an audit record, and
+// return a partial-aware receipt.
+//
+// A validation failure returns a non-nil error with nothing written. A
+// per-item execution failure is recorded in the receipt (no rollback);
+// the call still returns a nil error so the caller gets the partial
+// receipt. The I1 origin gate and audit-down degradation are layered on
+// by #53/#54 around this core.
+func (s *Service) Capture(ctx context.Context, in CaptureInput) (CaptureReceipt, error) {
+	if err := s.validate(in); err != nil {
+		return CaptureReceipt{}, err
+	}
+
+	declared := classification.Public // unspecified ⇒ lowest ⇒ target floor governs
+	if in.Context.Classification != "" {
+		// Already validated parseable.
+		declared, _ = classification.ParseLevel(in.Context.Classification)
+	}
+
+	effective, securityEvents := s.resolveClassification(declared, in)
+
+	// Server-derived origin governs the I1 gate; a caller-asserted harness
+	// label that names a different zone is descriptive-only and logged as a
+	// security event (spec §4.2: a control keyed on attacker-suppliable
+	// input is not a control).
+	if ev := assertedZoneMismatch(in.Context.Harness, in.Context.Origin); ev != "" {
+		securityEvents = append(securityEvents, ev)
+	}
+
+	// I1 sovereignty gate: a confidential capture through a us-nexus origin
+	// is refused before ANY write. The refusal itself is audited (best
+	// effort) — refusals must be reconstructable too.
+	if effective == classification.Confidential && in.Context.Origin == ZoneUSNexus {
+		_ = s.audit.Record(ctx, AuditEntry{
+			Timestamp:               s.now().UTC(),
+			Principal:               in.Context.Principal,
+			Actor:                   in.Context.Actor,
+			Harness:                 in.Context.Harness,
+			SessionRef:              in.Context.SessionRef,
+			EffectiveClassification: effective.String(),
+			Items:                   nil, // refused before any write
+			SecurityEvents:          append(securityEvents, "I1 refusal: confidential capture via us-nexus origin"),
+		}, AuditCentral)
+		return CaptureReceipt{}, fmt.Errorf("%w: effective classification confidential through %s origin",
+			ErrSovereigntyRefused, in.Context.Origin)
+	}
+
+	receipt := CaptureReceipt{
+		Errors:                  []ItemError{},
+		EffectiveClassification: effective.String(),
+		DryRun:                  in.DryRun,
+	}
+
+	if in.DryRun {
+		// Would-be receipt: mark planned items ok, write nothing (not even
+		// audit — dry_run touches nothing).
+		for range in.Insights {
+			receipt.Insights = append(receipt.Insights, InsightResult{OK: true})
+		}
+		for _, tk := range in.Tickets {
+			receipt.Tickets = append(receipt.Tickets, TicketResult{Repo: tk.Repo, Action: tk.Action, Number: tk.Number, OK: true})
+		}
+		if in.Summary != nil {
+			receipt.Summary = &SummaryResult{Path: s.summaryPath(in.Context, in.Summary), OK: true}
+		}
+		return receipt, nil
+	}
+
+	// I5 audit gate: decide BEFORE any write whether this capture can be
+	// audited at its effective classification. Confidential + central sink
+	// down → refuse here, before writing anything; the all-tiers floor
+	// (nothing can record) likewise refuses. Internal/public degrade to the
+	// durable local buffer (signalled by AuditBuffered).
+	outcome, err := s.audit.Reserve(ctx, effective)
+	if err != nil {
+		return CaptureReceipt{}, fmt.Errorf("%w: %v", ErrAuditUnavailable, err)
+	}
+
+	var landed []string
+
+	for i, ins := range in.Insights {
+		res, item, err := s.persistInsight(ctx, ins)
+		receipt.Insights = append(receipt.Insights, res)
+		if err != nil {
+			receipt.Errors = append(receipt.Errors, ItemError{Item: fmt.Sprintf("insight[%d]", i), Error: err.Error()})
+			continue
+		}
+		landed = append(landed, item)
+	}
+
+	for i, tk := range in.Tickets {
+		res, err := s.persistTicket(ctx, tk)
+		receipt.Tickets = append(receipt.Tickets, res)
+		if err != nil {
+			receipt.Errors = append(receipt.Errors, ItemError{Item: fmt.Sprintf("ticket[%d]", i), Error: err.Error()})
+			continue
+		}
+		landed = append(landed, fmt.Sprintf("ticket:%s#%d", tk.Repo, res.Number))
+	}
+
+	if in.Summary != nil {
+		res, err := s.persistSummary(ctx, in.Context, in.Summary)
+		receipt.Summary = &res
+		if err != nil {
+			receipt.Errors = append(receipt.Errors, ItemError{Item: "summary", Error: err.Error()})
+		} else {
+			landed = append(landed, "summary:"+res.Path)
+		}
+	}
+
+	// I5: persist the request-level audit record of exactly what landed,
+	// using the outcome reserved before the writes. AuditBuffered surfaces
+	// the degraded (locally-buffered) state on the receipt.
+	if err := s.audit.Record(ctx, AuditEntry{
+		Timestamp:               s.now().UTC(),
+		Principal:               in.Context.Principal,
+		Actor:                   in.Context.Actor,
+		Harness:                 in.Context.Harness,
+		SessionRef:              in.Context.SessionRef,
+		EffectiveClassification: effective.String(),
+		Items:                   landed,
+		SecurityEvents:          securityEvents,
+	}, outcome); err != nil {
+		receipt.Errors = append(receipt.Errors, ItemError{Item: "audit", Error: err.Error()})
+	}
+	if outcome == AuditBuffered {
+		receipt.AuditBuffered = true
+	}
+
+	return receipt, nil
+}
+
+// validate enforces fail-closed structural validity over the whole
+// request before any write. A bad declared classification, an invalid
+// wing/hall, an empty insight, or a malformed ticket aborts the capture
+// with nothing written.
+func (s *Service) validate(in CaptureInput) error {
+	if in.Context.Classification != "" {
+		if _, err := classification.ParseLevel(in.Context.Classification); err != nil {
+			return fmt.Errorf("context.classification: %w", err)
+		}
+	}
+	for i, ins := range in.Insights {
+		if strings.TrimSpace(ins.Text) == "" {
+			return fmt.Errorf("insight[%d]: text is required", i)
+		}
+		if strings.TrimSpace(ins.Wing) == "" {
+			return fmt.Errorf("insight[%d]: wing is required", i)
+		}
+		if !brain.IsValidHall(ins.Hall) {
+			return fmt.Errorf("insight[%d]: invalid hall %q", i, ins.Hall)
+		}
+	}
+	for i, tk := range in.Tickets {
+		if strings.TrimSpace(tk.Repo) == "" {
+			return fmt.Errorf("ticket[%d]: repo is required", i)
+		}
+		if !validActions[tk.Action] {
+			return fmt.Errorf("ticket[%d]: invalid action %q (want create/close/comment)", i, tk.Action)
+		}
+		if tk.Action == "create" && strings.TrimSpace(tk.Title) == "" {
+			return fmt.Errorf("ticket[%d]: create requires a title", i)
+		}
+		if (tk.Action == "close" || tk.Action == "comment") && tk.Number <= 0 {
+			return fmt.Errorf("ticket[%d]: %s requires an issue number", i, tk.Action)
+		}
+	}
+	return nil
+}
+
+// resolveClassification computes the effective level (stricter of
+// declared and every target's derived level) and collects a security
+// event whenever the caller under-declared relative to a target floor.
+func (s *Service) resolveClassification(declared classification.Level, in CaptureInput) (classification.Level, []string) {
+	effective := declared
+	var events []string
+	consider := func(kind classification.TargetKind, name string) {
+		derived := s.policy.Derive(classification.Target{Kind: kind, Name: name})
+		effective = classification.Stricter(effective, derived)
+		if declared < derived {
+			events = append(events, fmt.Sprintf("classification under-declared: declared=%s target=%s(%s) derived=%s",
+				declared, name, kindString(kind), derived))
+		}
+	}
+	for _, ins := range in.Insights {
+		consider(classification.WingTarget, ins.Wing)
+	}
+	for _, tk := range in.Tickets {
+		consider(classification.RepoTarget, tk.Repo)
+	}
+	if in.Summary != nil {
+		for _, repo := range in.Summary.ReposTouched {
+			consider(classification.RepoTarget, repo)
+		}
+	}
+	return effective, events
+}
+
+func (s *Service) persistInsight(ctx context.Context, ins Insight) (InsightResult, string, error) {
+	note := Note{Content: ins.Text, Wing: ins.Wing, Hall: ins.Hall, Filename: brain.Sanitise(firstLine(ins.Text))}
+	var ref Ref
+	var err error
+	if ins.SupersedeSlug != "" {
+		note.Reason = "superseded via capture"
+		ref, err = s.brain.Update(ctx, ins.SupersedeSlug, note)
+	} else {
+		ref, err = s.brain.Write(ctx, note)
+	}
+	if err != nil {
+		return InsightResult{OK: false, Superseded: ins.SupersedeSlug != ""}, "", err
+	}
+	return InsightResult{
+		ID: ref.ID, Path: ref.Path, ContentHash: ref.ContentHash,
+		Superseded: ref.Superseded, OK: true,
+	}, "insight:" + ref.ID, nil
+}
+
+func (s *Service) persistTicket(ctx context.Context, tk Ticket) (TicketResult, error) {
+	res := TicketResult{Repo: tk.Repo, Action: tk.Action, Number: tk.Number}
+	var ref IssueRef
+	var err error
+	switch tk.Action {
+	case "create":
+		ref, err = s.issues.CreateIssue(ctx, tk.Repo, tk.Title, tk.Body)
+	case "close":
+		ref, err = s.issues.CloseIssue(ctx, tk.Repo, tk.Number, tk.Body)
+	case "comment":
+		ref, err = s.issues.CommentIssue(ctx, tk.Repo, tk.Number, tk.Body)
+	}
+	if err != nil {
+		return res, err
+	}
+	if ref.Number != 0 {
+		res.Number = ref.Number
+	}
+	res.URL = ref.URL
+	res.OK = true
+	return res, nil
+}
+
+func (s *Service) persistSummary(ctx context.Context, c CaptureContext, sum *Summary) (SummaryResult, error) {
+	if s.summaries == nil {
+		return SummaryResult{OK: false}, fmt.Errorf("no summary writer configured")
+	}
+	path := s.summaryPath(c, sum)
+	content := s.renderSummary(c, sum)
+	repo := "ai-sessions"
+	if err := s.summaries.WriteFile(ctx, repo, path, content); err != nil {
+		return SummaryResult{Path: path, OK: false}, err
+	}
+	return SummaryResult{Path: path, OK: true}, nil
+}
+
+// summaryPath builds summaries/<harness>/<YYYY-MM>/<date>-<slug>-<ref8>.md.
+// The ref8 disambiguator is derived from the session_ref (or the title
+// when no ref is present) so distinct sessions never collide.
+func (s *Service) summaryPath(c CaptureContext, sum *Summary) string {
+	t := s.now().UTC()
+	slug := brain.Sanitise(sum.Title)
+	if slug == "" {
+		slug = "summary"
+	}
+	seed := c.SessionRef
+	if seed == "" {
+		seed = sum.Title + sum.Body
+	}
+	sum8 := shortHash(seed)
+	return fmt.Sprintf("summaries/%s/%s/%s-%s-%s.md",
+		brain.Sanitise(c.Harness), t.Format("2006-01"), t.Format("2006-01-02"), slug, sum8)
+}
+
+// renderSummary stamps fidelity + session metadata into frontmatter so the
+// richer-fidelity-supersedes-thinner collision rule has the data it needs.
+func (s *Service) renderSummary(c CaptureContext, sum *Summary) string {
+	var b strings.Builder
+	b.WriteString("---\n")
+	fmt.Fprintf(&b, "title: %s\n", sum.Title)
+	fmt.Fprintf(&b, "harness: %s\n", c.Harness)
+	if c.SessionRef != "" {
+		fmt.Fprintf(&b, "session_ref: %s\n", c.SessionRef)
+	}
+	fmt.Fprintf(&b, "fidelity: %s\n", c.Fidelity)
+	fmt.Fprintf(&b, "captured_at: %s\n", s.now().UTC().Format(time.RFC3339))
+	if len(sum.ReposTouched) > 0 {
+		fmt.Fprintf(&b, "repos_touched: [%s]\n", strings.Join(sum.ReposTouched, ", "))
+	}
+	b.WriteString("---\n\n")
+	b.WriteString(sum.Body)
+	if !strings.HasSuffix(sum.Body, "\n") {
+		b.WriteByte('\n')
+	}
+	return b.String()
+}
+
+func kindString(k classification.TargetKind) string {
+	if k == classification.RepoTarget {
+		return "repo"
+	}
+	return "wing"
+}
+
+func firstLine(s string) string {
+	s = strings.TrimSpace(s)
+	if i := strings.IndexByte(s, '\n'); i >= 0 {
+		s = s[:i]
+	}
+	s = strings.TrimLeft(s, "# ")
+	if len(s) > 60 {
+		s = s[:60]
+	}
+	return s
+}
+
+func shortHash(s string) string {
+	sum := sha256.Sum256([]byte(s))
+	return hex.EncodeToString(sum[:])[:8]
+}

ingestion/internal/capture/service_test.go

@@ -0,0 +1,471 @@
+package capture
+
+import (
+	"context"
+	"errors"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/mathiasbq/hyperguild/ingestion/internal/classification"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// --- fakes ---
+
+type fakeBrain struct {
+	writes  []Note
+	updates []Note
+	gets    []string
+	failOn  func(Note) error // nil = always succeed
+	hashSeq int
+}
+
+func (f *fakeBrain) ref(prefix string, n Note, superseded bool) Ref {
+	f.hashSeq++
+	path := "wiki/" + n.Wing + "/" + n.Hall + "/" + n.Filename + ".md"
+	return Ref{ID: path, Path: path, ContentHash: prefix + string(rune('0'+f.hashSeq)), Superseded: superseded}
+}
+
+func (f *fakeBrain) Write(_ context.Context, n Note) (Ref, error) {
+	if f.failOn != nil {
+		if err := f.failOn(n); err != nil {
+			return Ref{}, err
+		}
+	}
+	f.writes = append(f.writes, n)
+	return f.ref("w", n, false), nil
+}
+
+func (f *fakeBrain) Update(_ context.Context, slug string, n Note) (Ref, error) {
+	if f.failOn != nil {
+		if err := f.failOn(n); err != nil {
+			return Ref{}, err
+		}
+	}
+	n.Filename = slug
+	f.updates = append(f.updates, n)
+	return f.ref("u", n, true), nil
+}
+
+func (f *fakeBrain) Get(_ context.Context, id string) (StoredNote, error) {
+	f.gets = append(f.gets, id)
+	return StoredNote{ID: id, Path: id}, nil
+}
+
+type fakeTracker struct {
+	created  []string
+	closed   []int
+	comments []int
+	err      error
+}
+
+func (f *fakeTracker) CreateIssue(_ context.Context, repo, title, _ string) (IssueRef, error) {
+	if f.err != nil {
+		return IssueRef{}, f.err
+	}
+	f.created = append(f.created, repo+":"+title)
+	return IssueRef{Repo: repo, Number: 100 + len(f.created), URL: "https://git/" + repo + "/issues/x"}, nil
+}
+
+func (f *fakeTracker) CloseIssue(_ context.Context, repo string, number int, _ string) (IssueRef, error) {
+	if f.err != nil {
+		return IssueRef{}, f.err
+	}
+	f.closed = append(f.closed, number)
+	return IssueRef{Repo: repo, Number: number}, nil
+}
+
+func (f *fakeTracker) CommentIssue(_ context.Context, repo string, number int, _ string) (IssueRef, error) {
+	if f.err != nil {
+		return IssueRef{}, f.err
+	}
+	f.comments = append(f.comments, number)
+	return IssueRef{Repo: repo, Number: number}, nil
+}
+
+type fakeSummary struct {
+	paths   []string
+	content []string
+	err     error
+}
+
+func (f *fakeSummary) WriteFile(_ context.Context, _, path, content string) error {
+	if f.err != nil {
+		return f.err
+	}
+	f.paths = append(f.paths, path)
+	f.content = append(f.content, content)
+	return nil
+}
+
+// fakePolicy derives from an explicit map; default Internal so tests pin
+// behaviour without depending on the real defaulting.
+type fakePolicy struct{ tags map[string]classification.Level }
+
+func (p fakePolicy) Derive(t classification.Target) classification.Level {
+	if lvl, ok := p.tags[t.Name]; ok {
+		return lvl
+	}
+	return classification.Internal
+}
+
+type fakeAudit struct {
+	entries     []AuditEntry
+	err         error // Record error
+	reserveErr  error // Reserve error (refuse before write)
+	reserveMode AuditOutcome
+}
+
+func (f *fakeAudit) Reserve(_ context.Context, _ classification.Level) (AuditOutcome, error) {
+	if f.reserveErr != nil {
+		return 0, f.reserveErr
+	}
+	return f.reserveMode, nil
+}
+
+func (f *fakeAudit) Record(_ context.Context, e AuditEntry, _ AuditOutcome) error {
+	if f.err != nil {
+		return f.err
+	}
+	f.entries = append(f.entries, e)
+	return nil
+}
+
+// --- helpers ---
+
+func newSvc(b BrainStore, tr IssueTracker, sw SummaryWriter, p ClassificationPolicy, a AuditSink) *Service {
+	s := NewService(b, tr, sw, p, a)
+	s.now = func() time.Time { return time.Date(2026, 6, 22, 12, 0, 0, 0, time.UTC) }
+	return s
+}
+
+func baseCtx() CaptureContext {
+	return CaptureContext{Harness: "claude-code", Actor: "mathias", Principal: "mathias", Classification: "internal"}
+}
+
+// --- scenarios ---
+
+func TestCaptureHappyPath(t *testing.T) {
+	b := &fakeBrain{}
+	tr := &fakeTracker{}
+	au := &fakeAudit{}
+	svc := newSvc(b, tr, nil, fakePolicy{}, au)
+
+	rec, err := svc.Capture(context.Background(), CaptureInput{
+		Context: baseCtx(),
+		Insights: []Insight{
+			{Text: "a", Wing: "hyperguild", Hall: "decisions", SupersedeSlug: ""},
+			{Text: "b", Wing: "hyperguild", Hall: "facts"},
+		},
+		Tickets: []Ticket{{Repo: "hyperguild", Action: "create", Title: "do x", Body: "y"}},
+	})
+	require.NoError(t, err)
+	require.Len(t, rec.Insights, 2)
+	for _, r := range rec.Insights {
+		assert.True(t, r.OK)
+		assert.NotEmpty(t, r.ContentHash, "read-after-write hash returned")
+	}
+	require.Len(t, rec.Tickets, 1)
+	assert.True(t, rec.Tickets[0].OK)
+	assert.Equal(t, 2, len(b.writes))
+	assert.Empty(t, rec.Errors)
+	// Audit emitted naming principal/harness + items that landed.
+	require.Len(t, au.entries, 1)
+	assert.Equal(t, "mathias", au.entries[0].Principal)
+	assert.Equal(t, "claude-code", au.entries[0].Harness)
+	assert.Len(t, au.entries[0].Items, 3)
+}
+
+func TestCaptureSupersedeNotDuplicate(t *testing.T) {
+	b := &fakeBrain{}
+	svc := newSvc(b, &fakeTracker{}, nil, fakePolicy{}, &fakeAudit{})
+
+	rec, err := svc.Capture(context.Background(), CaptureInput{
+		Context:  baseCtx(),
+		Insights: []Insight{{Text: "revised", Wing: "hyperguild", Hall: "facts", SupersedeSlug: "prior-note"}},
+	})
+	require.NoError(t, err)
+	assert.Empty(t, b.writes, "supersede must not create")
+	require.Len(t, b.updates, 1)
+	assert.Equal(t, "prior-note", b.updates[0].Filename)
+	assert.True(t, rec.Insights[0].Superseded)
+}
+
+func TestCaptureValidationFailClosed(t *testing.T) {
+	b := &fakeBrain{}
+	tr := &fakeTracker{}
+	au := &fakeAudit{}
+	svc := newSvc(b, tr, nil, fakePolicy{}, au)
+
+	_, err := svc.Capture(context.Background(), CaptureInput{
+		Context: baseCtx(),
+		Insights: []Insight{
+			{Text: "ok", Wing: "hyperguild", Hall: "facts"},
+			{Text: "bad", Wing: "hyperguild", Hall: "garbage-hall"}, // invalid hall
+		},
+		Tickets: []Ticket{{Repo: "hyperguild", Action: "create", Title: "t"}},
+	})
+	require.Error(t, err)
+	// Nothing written anywhere.
+	assert.Empty(t, b.writes)
+	assert.Empty(t, b.updates)
+	assert.Empty(t, tr.created)
+	assert.Empty(t, au.entries)
+}
+
+func TestCaptureValidationRejectsBadTicket(t *testing.T) {
+	svc := newSvc(&fakeBrain{}, &fakeTracker{}, nil, fakePolicy{}, &fakeAudit{})
+	_, err := svc.Capture(context.Background(), CaptureInput{
+		Context: baseCtx(),
+		Tickets: []Ticket{{Repo: "hyperguild", Action: "frobnicate"}}, // bad action
+	})
+	require.Error(t, err)
+
+	_, err = svc.Capture(context.Background(), CaptureInput{
+		Context: baseCtx(),
+		Tickets: []Ticket{{Repo: "hyperguild", Action: "close"}}, // close needs number
+	})
+	require.Error(t, err)
+}
+
+func TestCapturePartialFailureBestEffort(t *testing.T) {
+	b := &fakeBrain{failOn: func(n Note) error {
+		if strings.Contains(n.Content, "FAIL") {
+			return errors.New("disk full")
+		}
+		return nil
+	}}
+	tr := &fakeTracker{}
+	au := &fakeAudit{}
+	svc := newSvc(b, tr, nil, fakePolicy{}, au)
+
+	rec, err := svc.Capture(context.Background(), CaptureInput{
+		Context: baseCtx(),
+		Insights: []Insight{
+			{Text: "good one", Wing: "hyperguild", Hall: "facts"},
+			{Text: "FAIL here", Wing: "hyperguild", Hall: "facts"},
+		},
+		Tickets: []Ticket{{Repo: "hyperguild", Action: "create", Title: "t"}},
+	})
+	require.NoError(t, err, "partial failure is not a request-level error")
+	assert.True(t, rec.Insights[0].OK)
+	assert.False(t, rec.Insights[1].OK)
+	assert.True(t, rec.Tickets[0].OK, "ticket still persisted; no rollback")
+	require.Len(t, rec.Errors, 1)
+	assert.Equal(t, "insight[1]", rec.Errors[0].Item)
+	// Audit reflects exactly what landed: 1 insight + 1 ticket.
+	require.Len(t, au.entries, 1)
+	assert.Len(t, au.entries[0].Items, 2)
+}
+
+func TestCaptureDryRunWritesNothing(t *testing.T) {
+	b := &fakeBrain{}
+	tr := &fakeTracker{}
+	au := &fakeAudit{}
+	svc := newSvc(b, tr, nil, fakePolicy{}, au)
+
+	rec, err := svc.Capture(context.Background(), CaptureInput{
+		Context:  baseCtx(),
+		DryRun:   true,
+		Insights: []Insight{{Text: "a", Wing: "hyperguild", Hall: "facts"}},
+		Tickets:  []Ticket{{Repo: "hyperguild", Action: "create", Title: "t"}},
+	})
+	require.NoError(t, err)
+	assert.True(t, rec.DryRun)
+	assert.Len(t, rec.Insights, 1)
+	assert.True(t, rec.Insights[0].OK, "would-be receipt marks planned items ok")
+	// Nothing written anywhere, including audit.
+	assert.Empty(t, b.writes)
+	assert.Empty(t, tr.created)
+	assert.Empty(t, au.entries)
+}
+
+func TestCaptureStricterClassificationWins(t *testing.T) {
+	// Caller declares internal; target wing tagged confidential → effective confidential + security event.
+	b := &fakeBrain{}
+	au := &fakeAudit{}
+	pol := fakePolicy{tags: map[string]classification.Level{"client-seb": classification.Confidential}}
+	svc := newSvc(b, &fakeTracker{}, nil, pol, au)
+
+	ctx := baseCtx()
+	ctx.Classification = "internal"
+	rec, err := svc.Capture(context.Background(), CaptureInput{
+		Context:  ctx,
+		Insights: []Insight{{Text: "x", Wing: "client-seb", Hall: "facts"}},
+	})
+	require.NoError(t, err)
+	assert.Equal(t, "confidential", rec.EffectiveClassification)
+	require.Len(t, au.entries, 1)
+	assert.NotEmpty(t, au.entries[0].SecurityEvents, "under-declaration logged as security event")
+	assert.Equal(t, "confidential", au.entries[0].EffectiveClassification)
+}
+
+func TestCaptureCallerRaisingSensitivityHonoured(t *testing.T) {
+	// Caller declares confidential; target internal → effective confidential, NOT a security event.
+	au := &fakeAudit{}
+	pol := fakePolicy{tags: map[string]classification.Level{"hyperguild": classification.Internal}}
+	svc := newSvc(&fakeBrain{}, &fakeTracker{}, nil, pol, au)
+
+	ctx := baseCtx()
+	ctx.Classification = "confidential"
+	rec, err := svc.Capture(context.Background(), CaptureInput{
+		Context:  ctx,
+		Insights: []Insight{{Text: "x", Wing: "hyperguild", Hall: "facts"}},
+	})
+	require.NoError(t, err)
+	assert.Equal(t, "confidential", rec.EffectiveClassification)
+	assert.Empty(t, au.entries[0].SecurityEvents, "raising sensitivity is honoured, not flagged")
+}
+
+func TestCaptureSummaryPathAndFidelity(t *testing.T) {
+	sw := &fakeSummary{}
+	svc := newSvc(&fakeBrain{}, &fakeTracker{}, sw, fakePolicy{}, &fakeAudit{})
+
+	ctx := baseCtx()
+	ctx.Fidelity = "transcript-parse"
+	ctx.SessionRef = "abc123def456"
+	rec, err := svc.Capture(context.Background(), CaptureInput{
+		Context: ctx,
+		Summary: &Summary{Title: "Session Wrap", Body: "did stuff", ReposTouched: []string{"hyperguild"}},
+	})
+	require.NoError(t, err)
+	require.NotNil(t, rec.Summary)
+	assert.True(t, rec.Summary.OK)
+	require.Len(t, sw.paths, 1)
+	assert.True(t, strings.HasPrefix(sw.paths[0], "summaries/claude-code/2026-06/"), "path: %s", sw.paths[0])
+	assert.Contains(t, sw.paths[0], "session-wrap")
+	assert.Contains(t, sw.content[0], "fidelity: transcript-parse", "fidelity stamped in frontmatter")
+}
+
+// --- I1 sovereignty gate (#53) ---
+
+func TestCaptureRefusesConfidentialViaUSNexus(t *testing.T) {
+	b := &fakeBrain{}
+	tr := &fakeTracker{}
+	au := &fakeAudit{}
+	pol := fakePolicy{tags: map[string]classification.Level{"client-seb": classification.Confidential}}
+	svc := newSvc(b, tr, nil, pol, au)
+
+	ctx := baseCtx()
+	ctx.Classification = "confidential"
+	ctx.Origin = ZoneUSNexus
+	_, err := svc.Capture(context.Background(), CaptureInput{
+		Context:  ctx,
+		Insights: []Insight{{Text: "x", Wing: "client-seb", Hall: "facts"}},
+	})
+	require.Error(t, err)
+	assert.ErrorIs(t, err, ErrSovereigntyRefused)
+	// Refused before any write.
+	assert.Empty(t, b.writes)
+	assert.Empty(t, tr.created)
+	// Refusal is audited.
+	require.Len(t, au.entries, 1)
+	assert.Empty(t, au.entries[0].Items, "no items landed on refusal")
+}
+
+func TestCaptureAllowsConfidentialViaSovereign(t *testing.T) {
+	b := &fakeBrain{}
+	pol := fakePolicy{tags: map[string]classification.Level{"client-seb": classification.Confidential}}
+	svc := newSvc(b, &fakeTracker{}, nil, pol, &fakeAudit{})
+
+	ctx := baseCtx()
+	ctx.Classification = "confidential"
+	ctx.Origin = ZoneSovereign
+	rec, err := svc.Capture(context.Background(), CaptureInput{
+		Context:  ctx,
+		Insights: []Insight{{Text: "x", Wing: "client-seb", Hall: "facts"}},
+	})
+	require.NoError(t, err)
+	assert.True(t, rec.Insights[0].OK)
+	assert.Len(t, b.writes, 1)
+}
+
+func TestCaptureAssertedLabelIgnoredAndLogged(t *testing.T) {
+	// Caller asserts harness "sovereign-soil" but principal resolves to
+	// us-nexus; confidential ⇒ refused, and the discrepancy is a security event.
+	au := &fakeAudit{}
+	pol := fakePolicy{tags: map[string]classification.Level{"client-seb": classification.Confidential}}
+	svc := newSvc(&fakeBrain{}, &fakeTracker{}, nil, pol, au)
+
+	ctx := baseCtx()
+	ctx.Harness = "sovereign-soil" // asserted
+	ctx.Origin = ZoneUSNexus       // server-derived
+	ctx.Classification = "confidential"
+	_, err := svc.Capture(context.Background(), CaptureInput{
+		Context:  ctx,
+		Insights: []Insight{{Text: "x", Wing: "client-seb", Hall: "facts"}},
+	})
+	require.ErrorIs(t, err, ErrSovereigntyRefused)
+	require.Len(t, au.entries, 1)
+	joined := strings.Join(au.entries[0].SecurityEvents, " | ")
+	assert.Contains(t, joined, "asserted-vs-derived origin mismatch")
+	assert.Contains(t, joined, "I1 refusal")
+}
+
+func TestCaptureInternalViaUSNexusAllowed(t *testing.T) {
+	// us-nexus origin is fine for non-confidential data.
+	b := &fakeBrain{}
+	svc := newSvc(b, &fakeTracker{}, nil, fakePolicy{}, &fakeAudit{})
+	ctx := baseCtx()
+	ctx.Origin = ZoneUSNexus // internal classification, so gate doesn't fire
+	rec, err := svc.Capture(context.Background(), CaptureInput{
+		Context:  ctx,
+		Insights: []Insight{{Text: "x", Wing: "hyperguild", Hall: "facts"}},
+	})
+	require.NoError(t, err)
+	assert.True(t, rec.Insights[0].OK)
+}
+
+// --- I5 audit gate (#54) ---
+
+func TestCaptureRefusesWhenAuditReserveFails(t *testing.T) {
+	// Reserve refusing (e.g. confidential + central sink down, or the floor)
+	// aborts the capture before any write.
+	b := &fakeBrain{}
+	tr := &fakeTracker{}
+	au := &fakeAudit{reserveErr: errors.New("central sink unreachable")}
+	svc := newSvc(b, tr, nil, fakePolicy{}, au)
+
+	_, err := svc.Capture(context.Background(), CaptureInput{
+		Context:  baseCtx(),
+		Insights: []Insight{{Text: "x", Wing: "hyperguild", Hall: "facts"}},
+	})
+	require.Error(t, err)
+	assert.ErrorIs(t, err, ErrAuditUnavailable)
+	assert.Empty(t, b.writes, "nothing written when audit unavailable")
+	assert.Empty(t, tr.created)
+}
+
+func TestCaptureFlagsLocallyBufferedAudit(t *testing.T) {
+	// Reserve returns AuditBuffered (internal/public, central down) → capture
+	// proceeds and the receipt flags the degraded audit state.
+	b := &fakeBrain{}
+	au := &fakeAudit{reserveMode: AuditBuffered}
+	svc := newSvc(b, &fakeTracker{}, nil, fakePolicy{}, au)
+
+	rec, err := svc.Capture(context.Background(), CaptureInput{
+		Context:  baseCtx(),
+		Insights: []Insight{{Text: "x", Wing: "hyperguild", Hall: "facts"}},
+	})
+	require.NoError(t, err)
+	assert.True(t, rec.Insights[0].OK, "capture proceeds on degraded audit")
+	assert.True(t, rec.AuditBuffered, "receipt flags locally-buffered audit")
+	require.Len(t, au.entries, 1)
+}
+
+func TestCaptureDryRunSkipsAuditGate(t *testing.T) {
+	// dry_run must not even probe the audit sink (writes nothing anywhere).
+	au := &fakeAudit{reserveErr: errors.New("would refuse")}
+	svc := newSvc(&fakeBrain{}, &fakeTracker{}, nil, fakePolicy{}, au)
+
+	rec, err := svc.Capture(context.Background(), CaptureInput{
+		Context:  baseCtx(),
+		DryRun:   true,
+		Insights: []Insight{{Text: "x", Wing: "hyperguild", Hall: "facts"}},
+	})
+	require.NoError(t, err, "dry-run does not hit the audit gate")
+	assert.True(t, rec.DryRun)
+	assert.Empty(t, au.entries)
+}

ingestion/internal/capturehttp/handler.go

@@ -0,0 +1,232 @@
+// Package capturehttp is the REST adapter for the capture use-case: the
+// POST /capture door (#53). It is deliberately thin — authenticate, derive
+// the trust-zone origin from the authenticated principal, decode the
+// request, call capture.Service, map the receipt to an HTTP status. No
+// business logic lives here; the I1 gate, validation, and orchestration
+// are all in the use-case.
+package capturehttp
+
+import (
+	"context"
+	"crypto/subtle"
+	"encoding/json"
+	"errors"
+	"io"
+	"net/http"
+	"strings"
+
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capture"
+)
+
+// Validator validates a Bearer JWT and returns its subject. The chassis
+// *auth.JWTValidator satisfies it (including its nil-receiver "disabled"
+// behaviour), and tests can substitute a fake without a live JWKS.
+type Validator interface {
+	Validate(ctx context.Context, rawToken string) (string, error)
+}
+
+// Handler serves POST /capture.
+type Handler struct {
+	svc             *capture.Service
+	validator       Validator // nil ⇒ JWT auth disabled
+	staticToken     string    // "" ⇒ static auth disabled
+	staticPrincipal string    // principal name attributed to static-token callers
+	resolver        OriginResolver
+}
+
+// New constructs a capture HTTP handler. staticToken callers are
+// attributed to staticPrincipal (a sovereign homelab identity); JWT
+// callers are attributed to their token subject.
+func New(svc *capture.Service, validator Validator, staticToken, staticPrincipal string, resolver OriginResolver) *Handler {
+	if staticPrincipal == "" {
+		staticPrincipal = "local-cli"
+	}
+	return &Handler{
+		svc:             svc,
+		validator:       validator,
+		staticToken:     staticToken,
+		staticPrincipal: staticPrincipal,
+		resolver:        resolver,
+	}
+}
+
+// wire types — the POST /capture request body.
+type request struct {
+	Context  contextBody   `json:"context"`
+	Insights []insightBody `json:"insights"`
+	Tickets  []ticketBody  `json:"tickets"`
+	Summary  *summaryBody  `json:"summary,omitempty"`
+	DryRun   bool          `json:"dry_run"`
+}
+
+type contextBody struct {
+	Harness        string `json:"harness"`
+	SessionRef     string `json:"session_ref"`
+	Fidelity       string `json:"fidelity"`
+	Actor          string `json:"actor"`
+	Classification string `json:"classification"`
+}
+
+type insightBody struct {
+	Text          string `json:"text"`
+	Wing          string `json:"wing"`
+	Hall          string `json:"hall"`
+	SupersedeSlug string `json:"supersede_slug,omitempty"`
+}
+
+type ticketBody struct {
+	Repo   string `json:"repo"`
+	Action string `json:"action"`
+	Number int    `json:"number,omitempty"`
+	Title  string `json:"title,omitempty"`
+	Body   string `json:"body,omitempty"`
+}
+
+type summaryBody struct {
+	Title        string   `json:"title"`
+	Body         string   `json:"body"`
+	ReposTouched []string `json:"repos_touched,omitempty"`
+}
+
+// ServeHTTP authenticates, derives origin, runs the use-case, and maps the
+// result to an HTTP status.
+func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	principal, viaStatic, ok := Authenticate(r, h.staticToken, h.staticPrincipal, h.validator)
+	if !ok {
+		http.Error(w, "unauthorized", http.StatusUnauthorized)
+		return
+	}
+
+	body, err := io.ReadAll(r.Body)
+	if err != nil {
+		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "read body"})
+		return
+	}
+	in, err := DecodeRequest(body)
+	if err != nil {
+		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "invalid JSON"})
+		return
+	}
+	// Principal and origin are server-derived — overwrite anything the
+	// caller may have tried to put in the body.
+	in.Context.Principal = principal
+	in.Context.Origin = h.resolver.Resolve(principal, viaStatic)
+
+	rec, err := h.svc.Capture(r.Context(), in)
+	switch {
+	case errors.Is(err, capture.ErrSovereigntyRefused):
+		writeJSON(w, http.StatusForbidden, map[string]string{"error": err.Error()})
+		return
+	case errors.Is(err, capture.ErrAuditUnavailable):
+		// I5 refusal: confidential + audit sink down, or the all-tiers floor.
+		writeJSON(w, http.StatusServiceUnavailable, map[string]string{"error": err.Error()})
+		return
+	case err != nil:
+		// Pre-write validation failure (fail-closed).
+		writeJSON(w, http.StatusBadRequest, map[string]string{"error": err.Error()})
+		return
+	}
+	writeJSON(w, statusFor(rec), rec)
+}
+
+// Authenticate mirrors the chassis Bearer precedence (static token wins,
+// then Dex JWT) and returns the resolved principal plus whether the static
+// path was taken — the chassis middleware hides both, and capture (REST or
+// MCP) needs them to derive the trust-zone origin. ok is false when no
+// credential matched.
+func Authenticate(r *http.Request, staticToken, staticPrincipal string, validator Validator) (principal string, viaStatic, ok bool) {
+	raw, found := strings.CutPrefix(r.Header.Get("Authorization"), "Bearer ")
+	if !found || raw == "" {
+		return "", false, false
+	}
+	if staticToken != "" && subtle.ConstantTimeCompare([]byte(raw), []byte(staticToken)) == 1 {
+		return staticPrincipal, true, true
+	}
+	if validator != nil {
+		if sub, err := validator.Validate(r.Context(), raw); err == nil && sub != "" {
+			return sub, false, true
+		}
+	}
+	return "", false, false
+}
+
+// DecodeRequest parses a capture request body into a CaptureInput. Shared
+// by the REST adapter and the MCP capture tool so the wire shape has one
+// definition. Principal and Origin are NOT set here — the caller sets them
+// from the authenticated identity.
+func DecodeRequest(data []byte) (capture.CaptureInput, error) {
+	var b request
+	if err := json.Unmarshal(data, &b); err != nil {
+		return capture.CaptureInput{}, err
+	}
+	return b.toInput(), nil
+}
+
+func (b request) toInput() capture.CaptureInput {
+	in := capture.CaptureInput{
+		Context: capture.CaptureContext{
+			Harness:        b.Context.Harness,
+			SessionRef:     b.Context.SessionRef,
+			Fidelity:       b.Context.Fidelity,
+			Actor:          b.Context.Actor,
+			Classification: b.Context.Classification,
+		},
+		DryRun: b.DryRun,
+	}
+	for _, i := range b.Insights {
+		in.Insights = append(in.Insights, capture.Insight{
+			Text: i.Text, Wing: i.Wing, Hall: i.Hall, SupersedeSlug: i.SupersedeSlug,
+		})
+	}
+	for _, t := range b.Tickets {
+		in.Tickets = append(in.Tickets, capture.Ticket{
+			Repo: t.Repo, Action: t.Action, Number: t.Number, Title: t.Title, Body: t.Body,
+		})
+	}
+	if b.Summary != nil {
+		in.Summary = &capture.Summary{
+			Title: b.Summary.Title, Body: b.Summary.Body, ReposTouched: b.Summary.ReposTouched,
+		}
+	}
+	return in
+}
+
+// statusFor maps a receipt to an HTTP status: 200 all-ok (or dry-run),
+// 207 partial, 502 everything-failed.
+func statusFor(rec capture.CaptureReceipt) int {
+	if rec.DryRun {
+		return http.StatusOK
+	}
+	var ok, fail int
+	for _, i := range rec.Insights {
+		count(&ok, &fail, i.OK)
+	}
+	for _, t := range rec.Tickets {
+		count(&ok, &fail, t.OK)
+	}
+	if rec.Summary != nil {
+		count(&ok, &fail, rec.Summary.OK)
+	}
+	switch {
+	case fail == 0:
+		return http.StatusOK
+	case ok == 0:
+		return http.StatusBadGateway // every persistence attempt failed
+	default:
+		return http.StatusMultiStatus // 207: partial success
+	}
+}
+
+func count(ok, fail *int, isOK bool) {
+	if isOK {
+		*ok++
+	} else {
+		*fail++
+	}
+}
+
+func writeJSON(w http.ResponseWriter, status int, v any) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	_ = json.NewEncoder(w).Encode(v)
+}

ingestion/internal/capturehttp/handler_test.go

@@ -0,0 +1,198 @@
+package capturehttp_test
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/mathiasbq/hyperguild/ingestion/internal/audit"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/brainstore"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capture"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capturehttp"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/classification"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+const staticTok = "static-secret"
+
+// fakeValidator stands in for the chassis JWT validator.
+type fakeValidator struct {
+	subject string
+	err     error
+}
+
+func (f fakeValidator) Validate(context.Context, string) (string, error) {
+	return f.subject, f.err
+}
+
+type fakeTracker struct{ failCreate bool }
+
+func (f fakeTracker) CreateIssue(context.Context, string, string, string) (capture.IssueRef, error) {
+	if f.failCreate {
+		return capture.IssueRef{}, errors.New("gitea down")
+	}
+	return capture.IssueRef{Repo: "hyperguild", Number: 1, URL: "https://git/1"}, nil
+}
+func (fakeTracker) CloseIssue(context.Context, string, int, string) (capture.IssueRef, error) {
+	return capture.IssueRef{}, nil
+}
+func (fakeTracker) CommentIssue(context.Context, string, int, string) (capture.IssueRef, error) {
+	return capture.IssueRef{}, nil
+}
+
+func newHandler(t *testing.T, v capturehttp.Validator, tr capture.IssueTracker, sovereign []string) *capturehttp.Handler {
+	t.Helper()
+	cfg, err := classification.Load(t.TempDir())
+	require.NoError(t, err)
+	svc := capture.NewService(brainstore.New(t.TempDir()), tr, nil, cfg, audit.NewSlogSink(nil))
+	return capturehttp.New(svc, v, staticTok, "local-cli", capturehttp.NewOriginResolver(sovereign))
+}
+
+func do(t *testing.T, h *capturehttp.Handler, authz string, body any) *httptest.ResponseRecorder {
+	t.Helper()
+	b, _ := json.Marshal(body)
+	req := httptest.NewRequest(http.MethodPost, "/capture", bytes.NewReader(b))
+	if authz != "" {
+		req.Header.Set("Authorization", authz)
+	}
+	rr := httptest.NewRecorder()
+	h.ServeHTTP(rr, req)
+	return rr
+}
+
+func internalReq() map[string]any {
+	return map[string]any{
+		"context":  map[string]any{"harness": "claude-code", "actor": "mathias", "classification": "internal"},
+		"insights": []map[string]any{{"text": "a fact", "wing": "hyperguild", "hall": "facts"}},
+	}
+}
+
+func TestUnauthorizedWithoutToken(t *testing.T) {
+	h := newHandler(t, fakeValidator{err: errors.New("no")}, fakeTracker{}, nil)
+	rr := do(t, h, "", internalReq())
+	assert.Equal(t, http.StatusUnauthorized, rr.Code)
+}
+
+func TestUnauthorizedBadToken(t *testing.T) {
+	h := newHandler(t, fakeValidator{err: errors.New("bad jwt")}, fakeTracker{}, nil)
+	rr := do(t, h, "Bearer wrong", internalReq())
+	assert.Equal(t, http.StatusUnauthorized, rr.Code)
+}
+
+func TestHappyPathStaticToken(t *testing.T) {
+	h := newHandler(t, nil, fakeTracker{}, nil)
+	rr := do(t, h, "Bearer "+staticTok, map[string]any{
+		"context":  map[string]any{"harness": "claude-code", "actor": "mathias", "classification": "internal"},
+		"insights": []map[string]any{{"text": "a fact", "wing": "hyperguild", "hall": "facts"}},
+		"tickets":  []map[string]any{{"repo": "hyperguild", "action": "create", "title": "t"}},
+	})
+	require.Equal(t, http.StatusOK, rr.Code)
+	var rec capture.CaptureReceipt
+	require.NoError(t, json.Unmarshal(rr.Body.Bytes(), &rec))
+	assert.True(t, rec.Insights[0].OK)
+	assert.True(t, rec.Tickets[0].OK)
+	assert.Empty(t, rec.Errors)
+}
+
+func TestConfidentialViaUSNexusRefused(t *testing.T) {
+	// JWT principal not in the sovereign allowlist ⇒ us-nexus; confidential ⇒ 403.
+	h := newHandler(t, fakeValidator{subject: "claudeai-oauth-client"}, fakeTracker{}, nil)
+	rr := do(t, h, "Bearer jwt-token", map[string]any{
+		"context":  map[string]any{"harness": "claudeai-chat", "actor": "mathias", "classification": "confidential"},
+		"insights": []map[string]any{{"text": "secret", "wing": "client-seb", "hall": "facts"}},
+	})
+	assert.Equal(t, http.StatusForbidden, rr.Code)
+	assert.Contains(t, rr.Body.String(), "sovereignty")
+}
+
+func TestConfidentialViaSovereignJWTAllowed(t *testing.T) {
+	// Same confidential payload, but the principal is allowlisted sovereign ⇒ allowed.
+	h := newHandler(t, fakeValidator{subject: "koala-cli"}, fakeTracker{}, []string{"koala-cli"})
+	rr := do(t, h, "Bearer jwt-token", map[string]any{
+		"context":  map[string]any{"harness": "claude-code", "actor": "mathias", "classification": "confidential"},
+		"insights": []map[string]any{{"text": "secret", "wing": "client-seb", "hall": "facts"}},
+	})
+	require.Equal(t, http.StatusOK, rr.Code)
+}
+
+func TestStaticTokenIsSovereignSoConfidentialAllowed(t *testing.T) {
+	h := newHandler(t, nil, fakeTracker{}, nil)
+	rr := do(t, h, "Bearer "+staticTok, map[string]any{
+		"context":  map[string]any{"harness": "claude-code", "actor": "mathias", "classification": "confidential"},
+		"insights": []map[string]any{{"text": "secret", "wing": "client-seb", "hall": "facts"}},
+	})
+	assert.Equal(t, http.StatusOK, rr.Code)
+}
+
+func TestValidationRejectedBeforeWrite(t *testing.T) {
+	h := newHandler(t, nil, fakeTracker{}, nil)
+	rr := do(t, h, "Bearer "+staticTok, map[string]any{
+		"context":  map[string]any{"actor": "mathias", "classification": "internal"},
+		"insights": []map[string]any{{"text": "x", "wing": "hyperguild", "hall": "not-a-hall"}},
+	})
+	assert.Equal(t, http.StatusBadRequest, rr.Code)
+}
+
+func TestPartialFailureIs207(t *testing.T) {
+	h := newHandler(t, nil, fakeTracker{failCreate: true}, nil)
+	rr := do(t, h, "Bearer "+staticTok, map[string]any{
+		"context":  map[string]any{"harness": "claude-code", "actor": "mathias", "classification": "internal"},
+		"insights": []map[string]any{{"text": "ok insight", "wing": "hyperguild", "hall": "facts"}},
+		"tickets":  []map[string]any{{"repo": "hyperguild", "action": "create", "title": "fails"}},
+	})
+	assert.Equal(t, http.StatusMultiStatus, rr.Code)
+	var rec capture.CaptureReceipt
+	require.NoError(t, json.Unmarshal(rr.Body.Bytes(), &rec))
+	assert.True(t, rec.Insights[0].OK)
+	assert.False(t, rec.Tickets[0].OK)
+	assert.Len(t, rec.Errors, 1)
+}
+
+func TestDryRunWritesNothing(t *testing.T) {
+	h := newHandler(t, nil, fakeTracker{}, nil)
+	rr := do(t, h, "Bearer "+staticTok, map[string]any{
+		"context":  map[string]any{"harness": "claude-code", "actor": "mathias", "classification": "internal"},
+		"insights": []map[string]any{{"text": "a", "wing": "hyperguild", "hall": "facts"}},
+		"dry_run":  true,
+	})
+	require.Equal(t, http.StatusOK, rr.Code)
+	var rec capture.CaptureReceipt
+	require.NoError(t, json.Unmarshal(rr.Body.Bytes(), &rec))
+	assert.True(t, rec.DryRun)
+}
+
+func TestCallerCannotForgeOrigin(t *testing.T) {
+	// Even if the body tried to assert a sovereign harness, a us-nexus JWT
+	// principal + confidential ⇒ refused. (Origin is server-derived.)
+	h := newHandler(t, fakeValidator{subject: "claudeai-oauth-client"}, fakeTracker{}, nil)
+	rr := do(t, h, "Bearer jwt", map[string]any{
+		"context":  map[string]any{"harness": "sovereign-soil", "actor": "mathias", "classification": "confidential"},
+		"insights": []map[string]any{{"text": "secret", "wing": "client-seb", "hall": "facts"}},
+	})
+	assert.Equal(t, http.StatusForbidden, rr.Code)
+}
+
+// refusingAudit refuses at Reserve (e.g. confidential + loki down, or floor).
+type refusingAudit struct{}
+
+func (refusingAudit) Reserve(context.Context, classification.Level) (capture.AuditOutcome, error) {
+	return 0, errors.New("central audit sink unreachable")
+}
+func (refusingAudit) Record(context.Context, capture.AuditEntry, capture.AuditOutcome) error {
+	return nil
+}
+
+func TestAuditUnavailableIs503(t *testing.T) {
+	cfg, err := classification.Load(t.TempDir())
+	require.NoError(t, err)
+	svc := capture.NewService(brainstore.New(t.TempDir()), fakeTracker{}, nil, cfg, refusingAudit{})
+	h := capturehttp.New(svc, nil, staticTok, "local-cli", capturehttp.NewOriginResolver(nil))
+
+	rr := do(t, h, "Bearer "+staticTok, internalReq())
+	assert.Equal(t, http.StatusServiceUnavailable, rr.Code)
+}

ingestion/internal/capturehttp/origin.go

@@ -0,0 +1,42 @@
+package capturehttp
+
+import "github.com/mathiasbq/hyperguild/ingestion/internal/capture"
+
+// OriginResolver maps an authenticated principal to its trust zone
+// (spec §4.2). The mapping is server-side and never reads caller input.
+//
+// Rules:
+//   - The static-token path is a homelab CLI caller on sovereign soil →
+//     ZoneSovereign.
+//   - A JWT principal in the sovereign allowlist → ZoneSovereign.
+//   - Any other JWT principal (e.g. claude.ai's OAuth identity, or any
+//     unrecognised subject) → ZoneUSNexus.
+//
+// The default is the strict one: an unknown principal is treated as
+// us-nexus so the I1 gate fails safe (refuses confidential), exactly as
+// an untagged classification target fails safe to confidential (#50).
+type OriginResolver struct {
+	sovereign map[string]bool
+}
+
+// NewOriginResolver builds a resolver whose JWT sovereign principals are
+// the given subjects. The static-token caller is always sovereign and
+// need not be listed.
+func NewOriginResolver(sovereignPrincipals []string) OriginResolver {
+	m := make(map[string]bool, len(sovereignPrincipals))
+	for _, p := range sovereignPrincipals {
+		if p != "" {
+			m[p] = true
+		}
+	}
+	return OriginResolver{sovereign: m}
+}
+
+// Resolve returns the trust zone for a principal. viaStatic is true when
+// the static-token auth path was taken.
+func (r OriginResolver) Resolve(principal string, viaStatic bool) capture.Zone {
+	if viaStatic || r.sovereign[principal] {
+		return capture.ZoneSovereign
+	}
+	return capture.ZoneUSNexus
+}

ingestion/internal/classification/classification.go

@@ -0,0 +1,189 @@
+// Package classification defines the data-sensitivity taxonomy and the
+// per-wing / per-repo tagging the capture server reads to enforce the I1
+// sovereignty gate (issue #50, capture spec §4.1).
+//
+// The single load-bearing property is fail-safe-to-strictest: a target
+// with no explicit tag and no known default classifies as Confidential,
+// never as something more permissive. A missing tag must never silently
+// downgrade — that would turn the I1 gate into theatre.
+//
+// Classification is read from an optional classification.yaml at the
+// brain root. A central, Flux-reconcilable file is deliberate: it is
+// auditable in one place (I2/I5), it does not require a live Gitea client
+// to classify a repo (so this package has no dependency on the gitea
+// tracker work), and it avoids tagging a wing's _index.md frontmatter —
+// which BuildWingIndex regenerates and would clobber.
+package classification
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"gopkg.in/yaml.v3"
+)
+
+// Level is a data-sensitivity tier. Higher is stricter, so the "stricter
+// wins" rule (spec §4.1 model C) is a plain max.
+type Level int
+
+const (
+	Public Level = iota
+	Internal
+	Confidential
+)
+
+// String returns the canonical lowercase token for a level.
+func (l Level) String() string {
+	switch l {
+	case Public:
+		return "public"
+	case Internal:
+		return "internal"
+	case Confidential:
+		return "confidential"
+	default:
+		return fmt.Sprintf("level(%d)", int(l))
+	}
+}
+
+// ParseLevel parses a level token (case-insensitive, surrounding space
+// tolerated). An unknown token is an error — callers must decide what to
+// do with bad input rather than have it silently coerced.
+func ParseLevel(s string) (Level, error) {
+	switch strings.ToLower(strings.TrimSpace(s)) {
+	case "public":
+		return Public, nil
+	case "internal":
+		return Internal, nil
+	case "confidential":
+		return Confidential, nil
+	default:
+		return Confidential, fmt.Errorf("unknown classification level %q (want public/internal/confidential)", s)
+	}
+}
+
+// Stricter returns the more restrictive of two levels.
+func Stricter(a, b Level) Level {
+	if a > b {
+		return a
+	}
+	return b
+}
+
+// TargetKind distinguishes the two kinds of capture destination.
+type TargetKind int
+
+const (
+	WingTarget TargetKind = iota // a brain wing (insights land here)
+	RepoTarget                   // a Gitea repo (tickets / summaries land here)
+)
+
+// Target names a capture destination to classify.
+type Target struct {
+	Kind TargetKind
+	Name string
+}
+
+// Config holds the explicit per-wing / per-repo classification tags read
+// from classification.yaml. Absent entries fall through to the built-in
+// defaults in defaultFor. The zero value (no file) is valid and applies
+// defaults to everything.
+type Config struct {
+	wings map[string]Level
+	repos map[string]Level
+}
+
+// rawConfig is the on-disk YAML shape: string→string maps, parsed into
+// validated levels by Load.
+type rawConfig struct {
+	Wings map[string]string `yaml:"wings"`
+	Repos map[string]string `yaml:"repos"`
+}
+
+// Load reads classification.yaml from brainDir. An absent file is not an
+// error — it yields an empty config where every target classifies by the
+// built-in defaults. A malformed file, or any unparseable level token in
+// it, is a hard error: a classification source the server cannot trust
+// must fail loud, not degrade silently.
+func Load(brainDir string) (*Config, error) {
+	cfg := &Config{wings: map[string]Level{}, repos: map[string]Level{}}
+
+	data, err := os.ReadFile(filepath.Join(brainDir, "classification.yaml"))
+	if err != nil {
+		if os.IsNotExist(err) {
+			return cfg, nil
+		}
+		return nil, fmt.Errorf("read classification.yaml: %w", err)
+	}
+
+	var raw rawConfig
+	if err := yaml.Unmarshal(data, &raw); err != nil {
+		return nil, fmt.Errorf("parse classification.yaml: %w", err)
+	}
+	for name, lvl := range raw.Wings {
+		parsed, perr := ParseLevel(lvl)
+		if perr != nil {
+			return nil, fmt.Errorf("wing %q: %w", name, perr)
+		}
+		cfg.wings[normalise(name)] = parsed
+	}
+	for name, lvl := range raw.Repos {
+		parsed, perr := ParseLevel(lvl)
+		if perr != nil {
+			return nil, fmt.Errorf("repo %q: %w", name, perr)
+		}
+		cfg.repos[normalise(name)] = parsed
+	}
+	return cfg, nil
+}
+
+// Derive returns the classification for any target — the function the
+// capture use-case calls per item.
+func (c *Config) Derive(t Target) Level {
+	if t.Kind == RepoTarget {
+		return c.Repo(t.Name)
+	}
+	return c.Wing(t.Name)
+}
+
+// Wing classifies a brain wing: an explicit tag wins, else defaults.
+func (c *Config) Wing(name string) Level {
+	if lvl, ok := c.wings[normalise(name)]; ok {
+		return lvl
+	}
+	return defaultFor(name)
+}
+
+// Repo classifies a Gitea repo: an explicit tag wins, else defaults.
+func (c *Config) Repo(name string) Level {
+	if lvl, ok := c.repos[normalise(name)]; ok {
+		return lvl
+	}
+	return defaultFor(name)
+}
+
+// defaultFor applies the built-in defaulting rules when a target has no
+// explicit tag:
+//   - client-* → Confidential (client work is confidential by default)
+//   - hyperguild / homelab → Internal (the operator's own infra)
+//   - everything else → Confidential (fail safe to strictest)
+func defaultFor(name string) Level {
+	n := normalise(name)
+	if strings.HasPrefix(n, "client-") {
+		return Confidential
+	}
+	switch n {
+	case "hyperguild", "homelab":
+		return Internal
+	default:
+		return Confidential
+	}
+}
+
+// normalise lowercases and trims a wing/repo name so matching and the
+// client-* prefix check are case-insensitive.
+func normalise(name string) string {
+	return strings.ToLower(strings.TrimSpace(name))
+}

ingestion/internal/classification/classification_test.go

@@ -0,0 +1,112 @@
+package classification
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestLevelOrderingAndString(t *testing.T) {
+	assert.True(t, Public < Internal)
+	assert.True(t, Internal < Confidential)
+	assert.Equal(t, "public", Public.String())
+	assert.Equal(t, "internal", Internal.String())
+	assert.Equal(t, "confidential", Confidential.String())
+}
+
+func TestParseLevel(t *testing.T) {
+	for s, want := range map[string]Level{
+		"public": Public, "internal": Internal, "confidential": Confidential,
+		"PUBLIC": Public, " Confidential ": Confidential,
+	} {
+		got, err := ParseLevel(s)
+		require.NoError(t, err, s)
+		assert.Equal(t, want, got, s)
+	}
+	_, err := ParseLevel("secret")
+	require.Error(t, err, "unknown level must error, not silently default")
+	_, err = ParseLevel("")
+	require.Error(t, err)
+}
+
+func TestStricterReturnsMax(t *testing.T) {
+	assert.Equal(t, Confidential, Stricter(Internal, Confidential))
+	assert.Equal(t, Confidential, Stricter(Confidential, Public))
+	assert.Equal(t, Internal, Stricter(Public, Internal))
+	assert.Equal(t, Public, Stricter(Public, Public))
+}
+
+func TestLoadAbsentFileIsDefaultsOnly(t *testing.T) {
+	cfg, err := Load(t.TempDir())
+	require.NoError(t, err, "absent classification.yaml must not be an error — defaults apply")
+	require.NotNil(t, cfg)
+	// Pure defaulting still works.
+	assert.Equal(t, Internal, cfg.Wing("hyperguild"))
+	assert.Equal(t, Confidential, cfg.Wing("anything-unknown"))
+}
+
+func TestLoadParsesExplicitTags(t *testing.T) {
+	dir := t.TempDir()
+	require.NoError(t, os.WriteFile(filepath.Join(dir, "classification.yaml"), []byte(
+		"wings:\n  research-public: public\n  hyperguild: confidential\nrepos:\n  infra: internal\n  research-public: public\n",
+	), 0o644))
+
+	cfg, err := Load(dir)
+	require.NoError(t, err)
+	// Explicit tag wins over the built-in default (hyperguild default is internal).
+	assert.Equal(t, Confidential, cfg.Wing("hyperguild"))
+	// Explicit public is honoured.
+	assert.Equal(t, Public, cfg.Wing("research-public"))
+	assert.Equal(t, Internal, cfg.Repo("infra"))
+	assert.Equal(t, Public, cfg.Repo("research-public"))
+}
+
+func TestLoadRejectsUnknownLevelInFile(t *testing.T) {
+	dir := t.TempDir()
+	require.NoError(t, os.WriteFile(filepath.Join(dir, "classification.yaml"),
+		[]byte("wings:\n  x: top-secret\n"), 0o644))
+	_, err := Load(dir)
+	require.Error(t, err, "an unparseable level in the config must fail loud, not be ignored")
+}
+
+func TestWingDefaulting(t *testing.T) {
+	cfg, err := Load(t.TempDir())
+	require.NoError(t, err)
+	cases := map[string]Level{
+		"client-seb":        Confidential, // client-* → confidential
+		"client-mastercard": Confidential,
+		"hyperguild":        Internal,
+		"homelab":           Internal,
+		"jepa-fx":           Confidential, // unknown → fail safe to strictest
+		"":                  Confidential, // empty → fail safe
+	}
+	for wing, want := range cases {
+		assert.Equal(t, want, cfg.Wing(wing), "wing %q", wing)
+	}
+}
+
+func TestRepoDefaulting(t *testing.T) {
+	cfg, err := Load(t.TempDir())
+	require.NoError(t, err)
+	assert.Equal(t, Confidential, cfg.Repo("client-seb-pipeline"))
+	assert.Equal(t, Internal, cfg.Repo("hyperguild"))
+	assert.Equal(t, Confidential, cfg.Repo("some-unknown-repo"), "untagged repo → confidential (fail safe)")
+}
+
+func TestDeriveUnifiedTarget(t *testing.T) {
+	cfg, err := Load(t.TempDir())
+	require.NoError(t, err)
+	assert.Equal(t, Internal, cfg.Derive(Target{Kind: WingTarget, Name: "homelab"}))
+	assert.Equal(t, Confidential, cfg.Derive(Target{Kind: RepoTarget, Name: "client-x"}))
+	assert.Equal(t, Confidential, cfg.Derive(Target{Kind: WingTarget, Name: "untagged"}))
+}
+
+func TestCaseInsensitiveMatching(t *testing.T) {
+	cfg, err := Load(t.TempDir())
+	require.NoError(t, err)
+	assert.Equal(t, Confidential, cfg.Wing("Client-SEB"), "client- prefix match is case-insensitive")
+	assert.Equal(t, Internal, cfg.Wing("HyperGuild"))
+}

ingestion/internal/gitea/gitea.go

@@ -0,0 +1,198 @@
+// Package gitea implements capture.IssueTracker against a Gitea instance
+// over its REST API. It is the new outbound dependency the brain server
+// gains for the capture capability (#49c/#52): the server otherwise does
+// brain-local file ops only.
+//
+// Owner is hard-coded to the operator and never taken from caller input.
+// The API token is read once at construction, held in the struct, and
+// never logged or placed in argv — it travels only in the Authorization
+// header of outbound requests (AGENTS.md secret-handling).
+package gitea
+
+import (
+	"bytes"
+	"context"
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capture"
+)
+
+// owner is the fixed repository owner for every ticket operation. It is a
+// constant, not a parameter, so a caller can never redirect a write to
+// another owner's repo.
+const owner = "mathias"
+
+// Client is a Gitea REST API IssueTracker.
+type Client struct {
+	baseURL string
+	token   string
+	http    *http.Client
+}
+
+// New constructs a Client. It returns nil when either baseURL or token is
+// empty, so callers can treat missing config as "tracker disabled" with a
+// single nil check (mirrors embed.New).
+func New(baseURL, token string) *Client {
+	if baseURL == "" || token == "" {
+		return nil
+	}
+	return &Client{
+		baseURL: strings.TrimRight(baseURL, "/"),
+		token:   token,
+		http:    &http.Client{Timeout: 15 * time.Second},
+	}
+}
+
+// issueResponse is the subset of a Gitea issue/comment payload we read.
+type issueResponse struct {
+	Number  int    `json:"number"`
+	HTMLURL string `json:"html_url"`
+}
+
+// CreateIssue opens a new issue under the fixed owner.
+func (c *Client) CreateIssue(ctx context.Context, repo, title, body string) (capture.IssueRef, error) {
+	var out issueResponse
+	if err := c.do(ctx, http.MethodPost,
+		fmt.Sprintf("/api/v1/repos/%s/%s/issues", owner, repo),
+		map[string]any{"title": title, "body": body}, &out); err != nil {
+		return capture.IssueRef{}, err
+	}
+	return capture.IssueRef{Repo: repo, Number: out.Number, URL: out.HTMLURL}, nil
+}
+
+// CommentIssue posts a comment on an existing issue.
+func (c *Client) CommentIssue(ctx context.Context, repo string, number int, body string) (capture.IssueRef, error) {
+	var out issueResponse
+	if err := c.do(ctx, http.MethodPost,
+		fmt.Sprintf("/api/v1/repos/%s/%s/issues/%d/comments", owner, repo, number),
+		map[string]any{"body": body}, &out); err != nil {
+		return capture.IssueRef{}, err
+	}
+	return capture.IssueRef{Repo: repo, Number: number, URL: out.HTMLURL}, nil
+}
+
+// CloseIssue closes an issue, first posting a closing comment when one is
+// given (empty comment ⇒ close only).
+func (c *Client) CloseIssue(ctx context.Context, repo string, number int, comment string) (capture.IssueRef, error) {
+	if strings.TrimSpace(comment) != "" {
+		if _, err := c.CommentIssue(ctx, repo, number, comment); err != nil {
+			return capture.IssueRef{}, err
+		}
+	}
+	var out issueResponse
+	if err := c.do(ctx, http.MethodPatch,
+		fmt.Sprintf("/api/v1/repos/%s/%s/issues/%d", owner, repo, number),
+		map[string]any{"state": "closed"}, &out); err != nil {
+		return capture.IssueRef{}, err
+	}
+	return capture.IssueRef{Repo: repo, Number: number, URL: out.HTMLURL}, nil
+}
+
+// WriteFile creates or updates a file in repo at path via the Gitea
+// contents API — the SummaryWriter port (#66). It upserts: a GET resolves
+// the current blob sha (if any) so an existing file is updated rather than
+// rejected (the richer-fidelity-supersedes rule for re-captured sessions).
+// Owner is the fixed const, like every other call.
+func (c *Client) WriteFile(ctx context.Context, repo, path, content string) error {
+	cpath := fmt.Sprintf("/api/v1/repos/%s/%s/contents/%s", owner, repo, path)
+	sha, err := c.fileSHA(ctx, cpath)
+	if err != nil {
+		return err
+	}
+	payload := map[string]any{
+		"message": "capture: " + path,
+		"content": base64.StdEncoding.EncodeToString([]byte(content)),
+	}
+	// Gitea contents API: POST creates a new file, PUT updates an existing
+	// one (PUT requires the current sha). Pick by whether the file exists.
+	method := http.MethodPost
+	if sha != "" {
+		method = http.MethodPut
+		payload["sha"] = sha
+	}
+	status, body, err := c.request(ctx, method, cpath, payload)
+	if err != nil {
+		return err
+	}
+	if status < 200 || status >= 300 {
+		return fmt.Errorf("gitea %s %s: status %d: %s", method, cpath, status, strings.TrimSpace(string(body)))
+	}
+	return nil
+}
+
+// fileSHA returns the current blob sha for a contents path, or "" when the
+// file does not exist (404). Any other non-2xx is an error.
+func (c *Client) fileSHA(ctx context.Context, cpath string) (string, error) {
+	status, body, err := c.request(ctx, http.MethodGet, cpath, nil)
+	if err != nil {
+		return "", err
+	}
+	if status == http.StatusNotFound {
+		return "", nil
+	}
+	if status < 200 || status >= 300 {
+		return "", fmt.Errorf("gitea GET %s: status %d: %s", cpath, status, strings.TrimSpace(string(body)))
+	}
+	var meta struct {
+		SHA string `json:"sha"`
+	}
+	if err := json.Unmarshal(body, &meta); err != nil {
+		return "", fmt.Errorf("gitea GET %s: decode: %w", cpath, err)
+	}
+	return meta.SHA, nil
+}
+
+// do performs a JSON request against the Gitea API and decodes a 2xx
+// response into out. Errors carry the status and a truncated body for
+// diagnosis but never the token.
+func (c *Client) do(ctx context.Context, method, path string, payload any, out *issueResponse) error {
+	status, body, err := c.request(ctx, method, path, payload)
+	if err != nil {
+		return err
+	}
+	if status < 200 || status >= 300 {
+		return fmt.Errorf("gitea %s %s: status %d: %s", method, path, status, strings.TrimSpace(string(body)))
+	}
+	if out != nil && len(body) > 0 {
+		if err := json.Unmarshal(body, out); err != nil {
+			return fmt.Errorf("gitea %s %s: decode response: %w", method, path, err)
+		}
+	}
+	return nil
+}
+
+// request is the shared HTTP path: marshals an optional JSON payload,
+// attaches auth (token only ever in the header), and returns the status +
+// body so callers can branch on status (e.g. 404) without it being an
+// error. Never logs the token.
+func (c *Client) request(ctx context.Context, method, path string, payload any) (int, []byte, error) {
+	var reader io.Reader
+	if payload != nil {
+		reqBody, err := json.Marshal(payload)
+		if err != nil {
+			return 0, nil, fmt.Errorf("marshal request: %w", err)
+		}
+		reader = bytes.NewReader(reqBody)
+	}
+	req, err := http.NewRequestWithContext(ctx, method, c.baseURL+path, reader)
+	if err != nil {
+		return 0, nil, err
+	}
+	req.Header.Set("Content-Type", "application/json")
+	req.Header.Set("Accept", "application/json")
+	req.Header.Set("Authorization", "token "+c.token)
+
+	resp, err := c.http.Do(req)
+	if err != nil {
+		return 0, nil, fmt.Errorf("gitea %s %s: %w", method, path, err)
+	}
+	defer func() { _ = resp.Body.Close() }()
+	body, _ := io.ReadAll(io.LimitReader(resp.Body, 8192))
+	return resp.StatusCode, body, nil
+}

ingestion/internal/gitea/gitea_test.go

@@ -0,0 +1,183 @@
+package gitea_test
+
+import (
+	"context"
+	"encoding/json"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/mathiasbq/hyperguild/ingestion/internal/gitea"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+const testToken = "super-secret-token-value"
+
+func TestNewNilWhenUnconfigured(t *testing.T) {
+	assert.Nil(t, gitea.New("", testToken))
+	assert.Nil(t, gitea.New("https://git.example", ""))
+}
+
+func TestCreateIssueForcesOwnerAndAuth(t *testing.T) {
+	var gotPath, gotAuth, gotBody string
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		gotPath = r.URL.Path
+		gotAuth = r.Header.Get("Authorization")
+		b, _ := io.ReadAll(r.Body)
+		gotBody = string(b)
+		assert.Equal(t, http.MethodPost, r.Method)
+		w.WriteHeader(http.StatusCreated)
+		_ = json.NewEncoder(w).Encode(map[string]any{"number": 42, "html_url": "https://git.d-ma.be/mathias/hyperguild/issues/42"})
+	}))
+	defer srv.Close()
+
+	c := gitea.New(srv.URL, testToken)
+	require.NotNil(t, c)
+	ref, err := c.CreateIssue(context.Background(), "hyperguild", "Do the thing", "details")
+	require.NoError(t, err)
+
+	assert.Equal(t, "/api/v1/repos/mathias/hyperguild/issues", gotPath, "owner forced to mathias")
+	assert.Equal(t, "token "+testToken, gotAuth)
+	assert.Contains(t, gotBody, "Do the thing")
+	assert.Equal(t, "hyperguild", ref.Repo)
+	assert.Equal(t, 42, ref.Number)
+	assert.Contains(t, ref.URL, "/issues/42")
+}
+
+func TestCommentIssue(t *testing.T) {
+	var gotPath string
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		gotPath = r.URL.Path
+		w.WriteHeader(http.StatusCreated)
+		_ = json.NewEncoder(w).Encode(map[string]any{"html_url": "https://git/c/1"})
+	}))
+	defer srv.Close()
+
+	ref, err := gitea.New(srv.URL, testToken).CommentIssue(context.Background(), "hyperguild", 7, "a comment")
+	require.NoError(t, err)
+	assert.Equal(t, "/api/v1/repos/mathias/hyperguild/issues/7/comments", gotPath)
+	assert.Equal(t, 7, ref.Number)
+}
+
+func TestCloseIssueWithComment(t *testing.T) {
+	var paths []string
+	var states []string
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		paths = append(paths, r.Method+" "+r.URL.Path)
+		if r.Method == http.MethodPatch {
+			var body map[string]any
+			b, _ := io.ReadAll(r.Body)
+			_ = json.Unmarshal(b, &body)
+			states = append(states, body["state"].(string))
+		}
+		w.WriteHeader(http.StatusOK)
+		_ = json.NewEncoder(w).Encode(map[string]any{"number": 9, "html_url": "https://git/i/9"})
+	}))
+	defer srv.Close()
+
+	ref, err := gitea.New(srv.URL, testToken).CloseIssue(context.Background(), "hyperguild", 9, "closing because done")
+	require.NoError(t, err)
+	assert.Equal(t, 9, ref.Number)
+	// Comment posted first, then state PATCHed to closed.
+	assert.Contains(t, paths, "POST /api/v1/repos/mathias/hyperguild/issues/9/comments")
+	assert.Contains(t, paths, "PATCH /api/v1/repos/mathias/hyperguild/issues/9")
+	assert.Equal(t, []string{"closed"}, states)
+}
+
+func TestCloseIssueNoComment(t *testing.T) {
+	var commented bool
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if strings.HasSuffix(r.URL.Path, "/comments") {
+			commented = true
+		}
+		w.WriteHeader(http.StatusOK)
+		_ = json.NewEncoder(w).Encode(map[string]any{"number": 3, "html_url": "https://git/i/3"})
+	}))
+	defer srv.Close()
+
+	_, err := gitea.New(srv.URL, testToken).CloseIssue(context.Background(), "hyperguild", 3, "")
+	require.NoError(t, err)
+	assert.False(t, commented, "empty comment ⇒ no comment POST")
+}
+
+func TestErrorPathDoesNotLeakToken(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
+		w.WriteHeader(http.StatusInternalServerError)
+		_, _ = w.Write([]byte("boom"))
+	}))
+	defer srv.Close()
+
+	_, err := gitea.New(srv.URL, testToken).CreateIssue(context.Background(), "hyperguild", "t", "b")
+	require.Error(t, err)
+	assert.NotContains(t, err.Error(), testToken, "token must never appear in an error message")
+	assert.Contains(t, err.Error(), "500")
+}
+
+func TestWriteFileCreatesNewFile(t *testing.T) {
+	var getPath, postPath, postBody string
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.Method {
+		case http.MethodGet:
+			getPath = r.URL.Path
+			w.WriteHeader(http.StatusNotFound) // file does not exist yet
+		case http.MethodPost: // gitea contents API: POST = create
+			postPath = r.URL.Path
+			b, _ := io.ReadAll(r.Body)
+			postBody = string(b)
+			w.WriteHeader(http.StatusCreated)
+			_ = json.NewEncoder(w).Encode(map[string]any{"content": map[string]any{"html_url": "https://git/x"}})
+		default:
+			t.Errorf("create must POST, got %s", r.Method)
+		}
+	}))
+	defer srv.Close()
+
+	err := gitea.New(srv.URL, testToken).WriteFile(context.Background(),
+		"ai-sessions", "summaries/claude-code/2026-06/2026-06-23-x-abcd1234.md", "# Summary\n\nbody\n")
+	require.NoError(t, err)
+	assert.Equal(t, "/api/v1/repos/mathias/ai-sessions/contents/summaries/claude-code/2026-06/2026-06-23-x-abcd1234.md", getPath)
+	assert.Equal(t, getPath, postPath)
+	// base64 of the content, no sha on create.
+	assert.Contains(t, postBody, "IyBTdW1tYXJ5") // base64("# Summary")
+	assert.NotContains(t, postBody, `"sha"`)
+}
+
+func TestWriteFileUpdatesExisting(t *testing.T) {
+	var putBody string
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		switch r.Method {
+		case http.MethodGet:
+			w.WriteHeader(http.StatusOK)
+			_ = json.NewEncoder(w).Encode(map[string]any{"sha": "deadbeef"})
+		case http.MethodPut:
+			b, _ := io.ReadAll(r.Body)
+			putBody = string(b)
+			w.WriteHeader(http.StatusOK)
+			_ = json.NewEncoder(w).Encode(map[string]any{"content": map[string]any{"html_url": "https://git/x"}})
+		}
+	}))
+	defer srv.Close()
+
+	err := gitea.New(srv.URL, testToken).WriteFile(context.Background(), "ai-sessions", "p/x.md", "new")
+	require.NoError(t, err)
+	assert.Contains(t, putBody, `"sha":"deadbeef"`, "existing file → update with sha")
+}
+
+func TestWriteFileErrorNoTokenLeak(t *testing.T) {
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if r.Method == http.MethodGet {
+			w.WriteHeader(http.StatusNotFound)
+			return
+		}
+		w.WriteHeader(http.StatusUnprocessableEntity)
+		_, _ = w.Write([]byte("bad"))
+	}))
+	defer srv.Close()
+	err := gitea.New(srv.URL, testToken).WriteFile(context.Background(), "ai-sessions", "p/x.md", "x")
+	require.Error(t, err)
+	assert.NotContains(t, err.Error(), testToken)
+	assert.Contains(t, err.Error(), "422")
+}

ingestion/internal/mcp/handlers.go

@@ -11,6 +11,7 @@ import (
 
 	"github.com/mathiasbq/hyperguild/ingestion/internal/api"
 	"github.com/mathiasbq/hyperguild/ingestion/internal/brain"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capture"
 	"github.com/mathiasbq/hyperguild/ingestion/internal/extract"
 	"github.com/mathiasbq/hyperguild/ingestion/internal/graphsync"
 	"github.com/mathiasbq/hyperguild/ingestion/internal/pipeline"
@@ -38,7 +39,7 @@ func (s *Server) tools() []map[string]any {
 		return b
 	}
 
-	return []map[string]any{
+	tools := []map[string]any{
 		{
 			"name":        "brain_query",
 			"description": "BM25 full-text search across brain/knowledge/ and brain/wiki/ markdown files. Optionally scope by wing (topic domain) and hall (memory type).",
@@ -81,6 +82,21 @@ func (s *Server) tools() []map[string]any {
 				"path": str("brain-relative path to the note; equivalent to id"),
 			}),
 		},
+		{
+			"name":        "brain_pending",
+			"description": "List notes in brain/raw/ awaiting human promotion to the wiki, oldest-first. Returns filename, created_at, size_bytes, excerpt. The human-review queue complement to brain_promote.",
+			"inputSchema": schema([]string{}, map[string]any{}),
+		},
+		{
+			"name":        "brain_promote",
+			"description": "Promote a brain/raw/ note into brain/wiki/<wing>/<hall>/: rewrites frontmatter (sets wing/hall/promoted_at, preserves created_at + custom fields), deletes the source, rebuilds the wing index, runs auto-tunnel. Errors (without touching the fs) on invalid hall or a slug collision. Returns {path}.",
+			"inputSchema": schema([]string{"filename", "wing", "hall"}, map[string]any{
+				"filename": str("basename in brain/raw/, e.g. 2026-06-01-lejpa-decision.md"),
+				"wing":     str("target wing, e.g. jepa-fx"),
+				"hall":     enum("target hall", halls...),
+				"slug":     str("optional target slug; defaults to filename minus date prefix"),
+			}),
+		},
 		{
 			"name":        "brain_tunnel",
 			"description": "Create an explicit bidirectional [[wikilink]] between two notes in different wings. Idempotent.",
@@ -171,6 +187,13 @@ func (s *Server) tools() []map[string]any {
 			}),
 		},
 	}
+	// The capture relay tool (#55) is advertised only when wired via
+	// WithCapture — MCP-native harnesses (claude.ai, Crush, Pi, LLM Council)
+	// reach capture through it.
+	if s.capture != nil {
+		tools = append(tools, captureToolDescriptor())
+	}
+	return tools
 }
 
 type brainQueryArgs struct {
@@ -219,7 +242,11 @@ func (s *Server) brainWrite(ctx context.Context, args json.RawMessage) (json.Raw
 	if err := json.Unmarshal(args, &a); err != nil {
 		return nil, fmt.Errorf("parse args: %w", err)
 	}
-	relPath, err := api.WriteNote(s.brainDir, api.WriteNoteOptions{
+	// Delegate to the shared BrainStore so write+index+tunnel+graph live in
+	// one implementation (capture uses the same store). The read-after-write
+	// handle {id, path, content_hash} comes back from the store; path is kept
+	// for backward compatibility.
+	ref, err := s.store.Write(ctx, capture.Note{
 		Content:  a.Content,
 		Filename: a.Filename,
 		Type:     a.Type,
@@ -230,22 +257,7 @@ func (s *Server) brainWrite(ctx context.Context, args json.RawMessage) (json.Raw
 	if err != nil {
 		return nil, err
 	}
-	// Auto-regenerate the wing _index.md when the write landed in the
+	return json.Marshal(map[string]string{"id": ref.ID, "path": ref.Path, "content_hash": ref.ContentHash})
-	// structured wiki, and auto-tunnel cross-wing matches. Both are
-	// best-effort: the note is already written.
-	if a.Wing != "" && a.Hall != "" {
-		if err := brain.BuildWingIndex(s.brainDir, a.Wing); err != nil {
-			slog.Warn("brain_write: auto-index failed", "wing", a.Wing, "err", err)
-		}
-		if err := brain.AutoTunnel(s.brainDir, relPath, a.Content); err != nil {
-			slog.Warn("brain_write: auto-tunnel failed", "src", relPath, "err", err)
-		}
-	}
-	s.indexInGraph(ctx, "brain_write", relPath)
-	// Read-after-write handle: id == relPath, content_hash == sha256 of
-	// the bytes just written. path is kept for backward compatibility.
-	_, _, hash, _ := api.ReadNote(s.brainDir, relPath)
-	return json.Marshal(map[string]string{"id": relPath, "path": relPath, "content_hash": hash})
 }
 
 type brainUpdateArgs struct {
@@ -274,50 +286,26 @@ func (s *Server) brainUpdate(ctx context.Context, args json.RawMessage) (json.Ra
 		return nil, fmt.Errorf("content is required")
 	}
 
-	opts := api.UpdateNoteOptions{Content: a.Content, Reason: a.Reason}
+	// path takes precedence over slug; the store treats any slug containing
-	switch {
+	// a slash as a full brain-relative path (issue #45: "slug ... OR path").
-	case a.Path != "":
+	slug := a.Slug
-		opts.Path = a.Path
+	if a.Path != "" {
-	case strings.Contains(a.Slug, "/"):
+		slug = a.Path
-		// slug carries a full path (issue #45: "slug ... OR full path").
-		opts.Path = a.Slug
-	default:
-		opts.Wing, opts.Hall, opts.Slug = a.Wing, a.Hall, a.Slug
 	}
-
+	ref, err := s.store.Update(ctx, slug, capture.Note{
-	relPath, hash, _, err := api.UpdateNote(s.brainDir, opts)
+		Content: a.Content,
+		Wing:    a.Wing,
+		Hall:    a.Hall,
+		Reason:  a.Reason,
+	})
 	if err != nil {
 		return nil, err
 	}
-
-	// Best-effort wiki upkeep, mirroring brain_write: rebuild the wing
-	// _index and re-tunnel cross-wing matches against the new body. Both
-	// are idempotent and never block — the note is already superseded.
-	if wing := wingFromRelPath(relPath); wing != "" {
-		if err := brain.BuildWingIndex(s.brainDir, wing); err != nil {
-			slog.Warn("brain_update: auto-index failed", "wing", wing, "err", err)
-		}
-		if err := brain.AutoTunnel(s.brainDir, relPath, a.Content); err != nil {
-			slog.Warn("brain_update: auto-tunnel failed", "src", relPath, "err", err)
-		}
-	}
-	s.indexInGraph(ctx, "brain_update", relPath)
-
 	return json.Marshal(map[string]any{
-		"id": relPath, "path": relPath, "content_hash": hash, "superseded": true,
+		"id": ref.ID, "path": ref.Path, "content_hash": ref.ContentHash, "superseded": ref.Superseded,
 	})
 }
 
-// wingFromRelPath extracts the wing segment from a structured wiki path
-// (wiki/<wing>/<hall>/<slug>.md). Returns "" for legacy/non-wiki paths.
-func wingFromRelPath(relPath string) string {
-	parts := strings.Split(relPath, "/")
-	if len(parts) >= 4 && parts[0] == "wiki" {
-		return parts[1]
-	}
-	return ""
-}
-
 type brainGetArgs struct {
 	ID   string `json:"id,omitempty"`
 	Path string `json:"path,omitempty"`
@@ -327,7 +315,7 @@ type brainGetArgs struct {
 // path — the de-facto handle). Read-only; the create-path read-after-
 // write primitive that lets callers confirm a write landed without a
 // lexical re-query.
-func (s *Server) brainGet(_ context.Context, args json.RawMessage) (json.RawMessage, error) {
+func (s *Server) brainGet(ctx context.Context, args json.RawMessage) (json.RawMessage, error) {
 	var a brainGetArgs
 	if err := json.Unmarshal(args, &a); err != nil {
 		return nil, fmt.Errorf("parse args: %w", err)
@@ -339,16 +327,50 @@ func (s *Server) brainGet(_ context.Context, args json.RawMessage) (json.RawMess
 	if target == "" {
 		return nil, fmt.Errorf("id or path is required")
 	}
-	fm, body, hash, err := api.ReadNote(s.brainDir, target)
+	note, err := s.store.Get(ctx, target)
 	if err != nil {
 		return nil, err
 	}
 	return json.Marshal(map[string]any{
-		"id": target, "path": target, "content_hash": hash,
+		"id": note.ID, "path": note.Path, "content_hash": note.ContentHash,
-		"frontmatter": fm, "body": body,
+		"frontmatter": note.Frontmatter, "body": note.Body,
 	})
 }
 
+// brainPending lists the raw/ review queue (oldest-first).
+func (s *Server) brainPending(_ context.Context, _ json.RawMessage) (json.RawMessage, error) {
+	pending, err := api.ListPending(s.brainDir)
+	if err != nil {
+		return nil, err
+	}
+	return json.Marshal(map[string]any{"pending": pending})
+}
+
+type brainPromoteArgs struct {
+	Filename string `json:"filename"`
+	Wing     string `json:"wing"`
+	Hall     string `json:"hall"`
+	Slug     string `json:"slug,omitempty"`
+}
+
+// brainPromote moves a raw/ note into the structured wiki (frontmatter
+// rewrite + index + auto-tunnel, all owned by api.PromoteNote) and then
+// re-indexes it into the graph. The human-facing complement to brain_write.
+func (s *Server) brainPromote(ctx context.Context, args json.RawMessage) (json.RawMessage, error) {
+	var a brainPromoteArgs
+	if err := json.Unmarshal(args, &a); err != nil {
+		return nil, fmt.Errorf("parse args: %w", err)
+	}
+	relPath, err := api.PromoteNote(s.brainDir, api.PromoteOptions{
+		Filename: a.Filename, Wing: a.Wing, Hall: a.Hall, Slug: a.Slug,
+	})
+	if err != nil {
+		return nil, err
+	}
+	s.indexInGraph(ctx, "brain_promote", relPath)
+	return json.Marshal(map[string]string{"path": relPath})
+}
+
 // indexInGraph is a best-effort wrapper around graphsync.IndexDoc that
 // logs failures but never propagates them — the underlying write/ingest
 // has already succeeded and the graph is an augmentation, not a

ingestion/internal/mcp/handlers_test.go

@@ -332,3 +332,61 @@ func TestSessionLogRequiresSessionID(t *testing.T) {
 	resp := toolCall(t, srv, "session_log", map[string]any{"skill": "tdd"})
 	require.NotNil(t, resp["error"])
 }
+
+func TestBrainPendingListsRaw(t *testing.T) {
+	brainDir := t.TempDir()
+	raw := filepath.Join(brainDir, "raw")
+	require.NoError(t, os.MkdirAll(raw, 0o755))
+	require.NoError(t, os.WriteFile(filepath.Join(raw, "2026-06-01-x.md"),
+		[]byte("---\ncreated_at: 2026-06-01T00:00:00Z\n---\npending body\n"), 0o644))
+	srv := mcp.NewServer(brainDir, nil, nil, nil)
+
+	resp := toolCall(t, srv, "brain_pending", map[string]any{})
+	require.Nil(t, resp["error"])
+	text := resp["result"].(map[string]any)["content"].([]any)[0].(map[string]any)["text"].(string)
+	assert.Contains(t, text, "2026-06-01-x.md")
+	assert.Contains(t, text, "pending body")
+}
+
+func TestBrainPendingEmpty(t *testing.T) {
+	srv := mcp.NewServer(t.TempDir(), nil, nil, nil)
+	resp := toolCall(t, srv, "brain_pending", map[string]any{})
+	require.Nil(t, resp["error"])
+	text := resp["result"].(map[string]any)["content"].([]any)[0].(map[string]any)["text"].(string)
+	assert.Contains(t, text, `"pending":[]`)
+}
+
+func TestBrainPromoteMovesToWiki(t *testing.T) {
+	brainDir := t.TempDir()
+	raw := filepath.Join(brainDir, "raw")
+	require.NoError(t, os.MkdirAll(raw, 0o755))
+	require.NoError(t, os.WriteFile(filepath.Join(raw, "2026-06-01-decision.md"),
+		[]byte("---\ncreated_at: 2026-06-01T00:00:00Z\n---\n# D\n\nbody\n"), 0o644))
+	srv := mcp.NewServer(brainDir, nil, nil, nil)
+
+	resp := toolCall(t, srv, "brain_promote", map[string]any{
+		"filename": "2026-06-01-decision.md", "wing": "jepa-fx", "hall": "decisions",
+	})
+	require.Nil(t, resp["error"], "got: %v", resp["error"])
+	text := resp["result"].(map[string]any)["content"].([]any)[0].(map[string]any)["text"].(string)
+	assert.Contains(t, text, "wiki/jepa-fx/decisions/decision.md")
+
+	_, err := os.Stat(filepath.Join(brainDir, "wiki/jepa-fx/decisions/decision.md"))
+	require.NoError(t, err)
+	_, srcErr := os.Stat(filepath.Join(raw, "2026-06-01-decision.md"))
+	assert.True(t, os.IsNotExist(srcErr), "source removed")
+}
+
+func TestBrainPromoteInvalidHallErrors(t *testing.T) {
+	brainDir := t.TempDir()
+	raw := filepath.Join(brainDir, "raw")
+	require.NoError(t, os.MkdirAll(raw, 0o755))
+	require.NoError(t, os.WriteFile(filepath.Join(raw, "x.md"), []byte("body\n"), 0o644))
+	srv := mcp.NewServer(brainDir, nil, nil, nil)
+	resp := toolCall(t, srv, "brain_promote", map[string]any{
+		"filename": "x.md", "wing": "a", "hall": "garbage",
+	})
+	require.NotNil(t, resp["error"])
+	_, srcErr := os.Stat(filepath.Join(raw, "x.md"))
+	assert.NoError(t, srcErr, "source untouched on validation error")
+}

ingestion/internal/mcp/server.go

@@ -1,7 +1,9 @@
 // Package mcp implements an MCP HTTP handler for the ingestion service.
 // Exposed tools: brain_query, brain_write, brain_update, brain_get,
-// brain_index, brain_tunnel, brain_ingest, brain_ingest_raw,
+// brain_pending, brain_promote, brain_index, brain_tunnel, brain_ingest,
-// brain_answer, brain_classify, brain_graph, brain_context, session_log.
+// brain_ingest_raw, brain_answer, brain_classify, brain_graph,
+// brain_context, session_log, and capture (the #55 relay tool, registered
+// only when WithCapture is set).
 package mcp
 
 import (
@@ -10,6 +12,9 @@ import (
 	"fmt"
 	"net/http"
 
+	"github.com/mathiasbq/hyperguild/ingestion/internal/brainstore"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capture"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capturehttp"
 	"github.com/mathiasbq/hyperguild/ingestion/internal/graphstore"
 	"github.com/mathiasbq/hyperguild/ingestion/internal/graphsync"
 	"github.com/mathiasbq/hyperguild/ingestion/internal/pipeline"
@@ -46,6 +51,21 @@ type Server struct {
 	vector    search.VectorSearcher // nil = BM25-only retrieval
 	embedder  search.Embedder       // nil = BM25-only retrieval
 	graph     graphsync.Store       // nil = brain_graph and GraphRAG augmentation disabled
+	store     *brainstore.Store     // shared brain write/update/get impl (also used by capture)
+	tracker   capture.IssueTracker  // nil = no Gitea ticket integration; wired for capture (#53)
+	capture   *captureDeps          // nil = capture MCP tool disabled (#55 relay)
+}
+
+// captureDeps holds what the MCP `capture` tool (the #55 relay door for
+// MCP-native harnesses like claude.ai) needs: the use-case, the auth bits
+// to re-derive the caller's principal from the Bearer header (the chassis
+// middleware gates but discards the principal), and the origin resolver.
+type captureDeps struct {
+	svc             *capture.Service
+	validator       capturehttp.Validator
+	staticToken     string
+	staticPrincipal string
+	resolver        capturehttp.OriginResolver
 }
 
 // NewServer constructs a Server bound to brainDir. pipelineCfg supplies the
@@ -56,7 +76,13 @@ func NewServer(brainDir string, pipelineCfg *pipeline.Config, llm pipeline.Compl
 	if pipelineCfg != nil {
 		cfg = *pipelineCfg
 	}
-	return &Server{brainDir: brainDir, pipeline: cfg, llm: llm, answerLLM: answerLLM}
+	return &Server{
+		brainDir:  brainDir,
+		pipeline:  cfg,
+		llm:       llm,
+		answerLLM: answerLLM,
+		store:     brainstore.New(brainDir),
+	}
 }
 
 // WithReranker installs an opt-in cross-encoder reranker. When set,
@@ -84,9 +110,55 @@ func (s *Server) WithHybridRetrieval(v search.VectorSearcher, e search.Embedder)
 func (s *Server) WithGraph(g *graphstore.PGStore) *Server {
 	if g == nil {
 		s.graph = nil
+		s.store.WithGraph(nil)
 		return s
 	}
 	s.graph = g
+	s.store.WithGraph(g)
+	return s
+}
+
+// WithIssueTracker injects the Gitea ticket tracker behind the
+// capture.IssueTracker interface. nil leaves ticket integration off. The
+// use-case (capture) consumes this in #53; it is wired here so the
+// dependency is constructed once and stays swappable/testable.
+func (s *Server) WithIssueTracker(t capture.IssueTracker) *Server {
+	s.tracker = t
+	return s
+}
+
+// IssueTracker returns the injected ticket tracker (nil when unconfigured).
+func (s *Server) IssueTracker() capture.IssueTracker {
+	return s.tracker
+}
+
+// BrainStore returns the shared brain store (graph-wired once WithGraph
+// has run), so the capture use-case writes through the exact same
+// implementation as the MCP handlers.
+func (s *Server) BrainStore() *brainstore.Store {
+	return s.store
+}
+
+// WithCapture enables the MCP `capture` tool (#55) — the relay door for
+// MCP-native harnesses (claude.ai, Crush, Pi, LLM Council) that cannot run
+// the use-case in-process. It forwards to the same CaptureService as
+// POST /capture, deriving the caller's principal + origin from the same
+// auth credentials that gate /mcp. nil svc leaves the tool unregistered.
+func (s *Server) WithCapture(svc *capture.Service, validator capturehttp.Validator, staticToken, staticPrincipal string, resolver capturehttp.OriginResolver) *Server {
+	if svc == nil {
+		s.capture = nil
+		return s
+	}
+	if staticPrincipal == "" {
+		staticPrincipal = "local-cli"
+	}
+	s.capture = &captureDeps{
+		svc:             svc,
+		validator:       validator,
+		staticToken:     staticToken,
+		staticPrincipal: staticPrincipal,
+		resolver:        resolver,
+	}
 	return s
 }
 
@@ -139,7 +211,18 @@ func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 			rpcErr = &rpcError{Code: -32602, Message: "invalid params"}
 			break
 		}
-		out, err := s.handleCall(r.Context(), p.Name, p.Arguments)
+		// Re-derive the authenticated principal from the Bearer header so
+		// the capture tool can compute the trust-zone origin. The request
+		// is already gated by BearerMiddleware; this only recovers the
+		// identity that middleware discards.
+		ctx := r.Context()
+		if s.capture != nil {
+			if principal, viaStatic, ok := capturehttp.Authenticate(
+				r, s.capture.staticToken, s.capture.staticPrincipal, s.capture.validator); ok {
+				ctx = withPrincipal(ctx, principal, viaStatic)
+			}
+		}
+		out, err := s.handleCall(ctx, p.Name, p.Arguments)
 		if err != nil {
 			rpcErr = &rpcError{Code: -32000, Message: err.Error()}
 			break
@@ -181,6 +264,12 @@ func (s *Server) handleCall(ctx context.Context, name string, args json.RawMessa
 		return s.brainUpdate(ctx, args)
 	case "brain_get":
 		return s.brainGet(ctx, args)
+	case "brain_pending":
+		return s.brainPending(ctx, args)
+	case "brain_promote":
+		return s.brainPromote(ctx, args)
+	case "capture":
+		return s.brainCapture(ctx, args)
 	case "brain_index":
 		return s.brainIndex(ctx, args)
 	case "brain_tunnel":

ingestion/internal/mcp/server_test.go

@@ -2,12 +2,14 @@ package mcp_test
 
 import (
 	"bytes"
+	"context"
 	"encoding/json"
 	"net/http"
 	"net/http/httptest"
 	"strings"
 	"testing"
 
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capture"
 	"github.com/mathiasbq/hyperguild/ingestion/internal/mcp"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -56,6 +58,7 @@ func TestServerToolsList(t *testing.T) {
 	}
 	assert.ElementsMatch(t, []string{
 		"brain_query", "brain_write", "brain_update", "brain_get",
+		"brain_pending", "brain_promote",
 		"brain_index", "brain_tunnel",
 		"brain_ingest_raw", "brain_ingest",
 		"brain_answer", "brain_classify", "brain_graph", "brain_context",
@@ -93,3 +96,22 @@ func TestServerUnknownMethodReturnsError(t *testing.T) {
 	assert.Equal(t, float64(-32601), errObj["code"])
 	assert.Contains(t, errObj["message"].(string), "unknown/method")
 }
+
+type stubTracker struct{}
+
+func (stubTracker) CreateIssue(context.Context, string, string, string) (capture.IssueRef, error) {
+	return capture.IssueRef{}, nil
+}
+func (stubTracker) CloseIssue(context.Context, string, int, string) (capture.IssueRef, error) {
+	return capture.IssueRef{}, nil
+}
+func (stubTracker) CommentIssue(context.Context, string, int, string) (capture.IssueRef, error) {
+	return capture.IssueRef{}, nil
+}
+
+func TestWithIssueTrackerInjects(t *testing.T) {
+	srv := mcp.NewServer(t.TempDir(), nil, nil, nil)
+	assert.Nil(t, srv.IssueTracker(), "tracker is off by default")
+	srv = srv.WithIssueTracker(stubTracker{})
+	assert.NotNil(t, srv.IssueTracker(), "tracker injected behind the interface")
+}

ingestion/internal/mcp/tools_capture.go

@@ -0,0 +1,105 @@
+package mcp
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capturehttp"
+)
+
+// principalKey is the context key under which the authenticated principal
+// (re-derived in ServeHTTP) is stashed for the capture tool.
+type principalKeyT struct{}
+
+var principalKey principalKeyT
+
+type principalInfo struct {
+	principal string
+	viaStatic bool
+}
+
+func withPrincipal(ctx context.Context, principal string, viaStatic bool) context.Context {
+	return context.WithValue(ctx, principalKey, principalInfo{principal: principal, viaStatic: viaStatic})
+}
+
+// captureToolDescriptor is the tools/list entry for the capture relay.
+// Appended only when WithCapture has wired the tool.
+func captureToolDescriptor() map[string]any {
+	str := func(d string) map[string]any { return map[string]any{"type": "string", "description": d} }
+	insightItem := map[string]any{
+		"type": "object",
+		"properties": map[string]any{
+			"text": str("the insight body"), "wing": str("brain wing"),
+			"hall": str("brain hall (facts/decisions/failures/hypotheses/sources)"),
+			"supersede_slug": str("optional: slug of a prior note to revise in place instead of creating"),
+		},
+		"required": []string{"text", "wing", "hall"},
+	}
+	ticketItem := map[string]any{
+		"type": "object",
+		"properties": map[string]any{
+			"repo": str("gitea repo (owner is always mathias)"), "action": str("create|close|comment"),
+			"number": map[string]any{"type": "integer", "description": "issue number (close/comment)"},
+			"title": str("issue title (create)"), "body": str("issue/comment body"),
+		},
+		"required": []string{"repo", "action"},
+	}
+	schema := map[string]any{
+		"type": "object",
+		"properties": map[string]any{
+			"context": map[string]any{
+				"type": "object",
+				"properties": map[string]any{
+					"harness": str("descriptive harness label (telemetry only, never a gate input)"),
+					"session_ref": str("optional session reference"), "fidelity": str("live-capture|transcript-parse|agent-runlog"),
+					"actor": str("acting user/agent"), "classification": str("caller-declared sensitivity: public|internal|confidential"),
+				},
+			},
+			"insights": map[string]any{"type": "array", "items": insightItem},
+			"tickets":  map[string]any{"type": "array", "items": ticketItem},
+			"summary": map[string]any{"type": "object", "properties": map[string]any{
+				"title": str("summary title"), "body": str("summary body"),
+				"repos_touched": map[string]any{"type": "array", "items": map[string]any{"type": "string"}},
+			}},
+			"dry_run": map[string]any{"type": "boolean", "description": "validate + return the would-be receipt, write nothing"},
+		},
+	}
+	b, _ := json.Marshal(schema)
+	return map[string]any{
+		"name":        "capture",
+		"description": "Persist a session's value uniformly: insights → brain (write or supersede), action items → Gitea tickets, optional summary → ai-sessions. The relay door for MCP-native harnesses. Origin is server-derived from your authenticated identity; confidential captures through a us-nexus surface are refused (I1). Returns a partial-aware receipt.",
+		"inputSchema": json.RawMessage(b),
+	}
+}
+
+// brainCapture is the MCP capture tool: the #55 relay for MCP-native
+// harnesses. It re-uses the same CaptureService, principal-derivation, and
+// origin resolver as POST /capture — only the transport differs. It holds
+// no state and retains nothing beyond the I5 audit record.
+func (s *Server) brainCapture(ctx context.Context, args json.RawMessage) (json.RawMessage, error) {
+	if s.capture == nil {
+		return nil, fmt.Errorf("capture tool not configured")
+	}
+	info, ok := ctx.Value(principalKey).(principalInfo)
+	if !ok || info.principal == "" {
+		// No authenticated principal ⇒ cannot derive origin ⇒ cannot gate.
+		return nil, fmt.Errorf("capture requires an authenticated principal")
+	}
+
+	in, err := capturehttp.DecodeRequest(args)
+	if err != nil {
+		return nil, fmt.Errorf("invalid capture request: %w", err)
+	}
+	// Principal and origin are server-derived — never taken from the body.
+	in.Context.Principal = info.principal
+	in.Context.Origin = s.capture.resolver.Resolve(info.principal, info.viaStatic)
+
+	rec, err := s.capture.svc.Capture(ctx, in)
+	if err != nil {
+		// Surface I1/I5 refusals and validation failures verbatim; errors.Is
+		// markers (ErrSovereigntyRefused / ErrAuditUnavailable) ride in the message.
+		return nil, err
+	}
+	return json.Marshal(rec)
+}

ingestion/internal/mcp/tools_capture_test.go

@@ -0,0 +1,150 @@
+package mcp_test
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"net/http"
+	"net/http/httptest"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/mathiasbq/hyperguild/ingestion/internal/audit"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/brainstore"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capture"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/capturehttp"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/classification"
+	"github.com/mathiasbq/hyperguild/ingestion/internal/mcp"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+const capStaticTok = "cap-static-tok"
+
+type capFakeTracker struct{}
+
+func (capFakeTracker) CreateIssue(context.Context, string, string, string) (capture.IssueRef, error) {
+	return capture.IssueRef{Repo: "hyperguild", Number: 1, URL: "https://git/1"}, nil
+}
+func (capFakeTracker) CloseIssue(context.Context, string, int, string) (capture.IssueRef, error) {
+	return capture.IssueRef{}, nil
+}
+func (capFakeTracker) CommentIssue(context.Context, string, int, string) (capture.IssueRef, error) {
+	return capture.IssueRef{}, nil
+}
+
+type capFakeValidator struct {
+	subject string
+	err     error
+}
+
+func (v capFakeValidator) Validate(context.Context, string) (string, error) {
+	return v.subject, v.err
+}
+
+func captureServer(t *testing.T, validator capturehttp.Validator, sovereign []string) (*mcp.Server, string) {
+	t.Helper()
+	brainDir := t.TempDir()
+	cfg, err := classification.Load(brainDir)
+	require.NoError(t, err)
+	svc := capture.NewService(brainstore.New(brainDir), capFakeTracker{}, nil, cfg, audit.NewSlogSink(nil))
+	srv := mcp.NewServer(brainDir, nil, nil, nil)
+	srv.WithCapture(svc, validator, capStaticTok, "local-cli", capturehttp.NewOriginResolver(sovereign))
+	return srv, brainDir
+}
+
+func captureCall(t *testing.T, srv http.Handler, authz string, args map[string]any) map[string]any {
+	t.Helper()
+	body, _ := json.Marshal(map[string]any{
+		"jsonrpc": "2.0", "id": 1, "method": "tools/call",
+		"params": map[string]any{"name": "capture", "arguments": args},
+	})
+	req := httptest.NewRequest(http.MethodPost, "/mcp", bytes.NewReader(body))
+	if authz != "" {
+		req.Header.Set("Authorization", authz)
+	}
+	rr := httptest.NewRecorder()
+	srv.ServeHTTP(rr, req)
+	var resp map[string]any
+	require.NoError(t, json.Unmarshal(rr.Body.Bytes(), &resp))
+	return resp
+}
+
+func TestCaptureToolListedWhenWired(t *testing.T) {
+	srv, _ := captureServer(t, nil, nil)
+	body, _ := json.Marshal(map[string]any{"jsonrpc": "2.0", "id": 1, "method": "tools/list"})
+	req := httptest.NewRequest(http.MethodPost, "/mcp", bytes.NewReader(body))
+	rr := httptest.NewRecorder()
+	srv.ServeHTTP(rr, req)
+	assert.Contains(t, rr.Body.String(), `"capture"`)
+}
+
+func TestCaptureToolNotListedByDefault(t *testing.T) {
+	srv := mcp.NewServer(t.TempDir(), nil, nil, nil) // no WithCapture
+	body, _ := json.Marshal(map[string]any{"jsonrpc": "2.0", "id": 1, "method": "tools/list"})
+	req := httptest.NewRequest(http.MethodPost, "/mcp", bytes.NewReader(body))
+	rr := httptest.NewRecorder()
+	srv.ServeHTTP(rr, req)
+	assert.NotContains(t, rr.Body.String(), `"capture"`)
+}
+
+func TestCaptureToolForwardsViaStaticPrincipal(t *testing.T) {
+	srv, brainDir := captureServer(t, nil, nil)
+	resp := captureCall(t, srv, "Bearer "+capStaticTok, map[string]any{
+		"context":  map[string]any{"harness": "claude-code", "actor": "mathias", "classification": "internal"},
+		"insights": []map[string]any{{"text": "a fact", "wing": "hyperguild", "hall": "facts"}},
+		"tickets":  []map[string]any{{"repo": "hyperguild", "action": "create", "title": "t"}},
+	})
+	require.Nil(t, resp["error"], "got error: %v", resp["error"])
+	text := resp["result"].(map[string]any)["content"].([]any)[0].(map[string]any)["text"].(string)
+	var rec capture.CaptureReceipt
+	require.NoError(t, json.Unmarshal([]byte(text), &rec))
+	assert.True(t, rec.Insights[0].OK)
+	assert.True(t, rec.Tickets[0].OK)
+	// Forwarded to the real brain store.
+	_, statErr := os.Stat(filepath.Join(brainDir, "wiki/hyperguild/facts"))
+	require.NoError(t, statErr)
+}
+
+func TestCaptureToolRefusesConfidentialViaUSNexus(t *testing.T) {
+	// JWT principal not in the sovereign allowlist ⇒ us-nexus origin.
+	srv, _ := captureServer(t, capFakeValidator{subject: "claudeai-oauth"}, nil)
+	resp := captureCall(t, srv, "Bearer jwt-token", map[string]any{
+		"context":  map[string]any{"harness": "claudeai-chat", "actor": "mathias", "classification": "confidential"},
+		"insights": []map[string]any{{"text": "secret", "wing": "client-seb", "hall": "facts"}},
+	})
+	require.NotNil(t, resp["error"])
+	assert.Contains(t, resp["error"].(map[string]any)["message"].(string), "sovereignty")
+}
+
+func TestCaptureToolAllowsConfidentialViaSovereignJWT(t *testing.T) {
+	srv, _ := captureServer(t, capFakeValidator{subject: "koala-cli"}, []string{"koala-cli"})
+	resp := captureCall(t, srv, "Bearer jwt-token", map[string]any{
+		"context":  map[string]any{"harness": "claude-code", "actor": "mathias", "classification": "confidential"},
+		"insights": []map[string]any{{"text": "secret", "wing": "client-seb", "hall": "facts"}},
+	})
+	assert.Nil(t, resp["error"], "sovereign JWT principal should be allowed: %v", resp["error"])
+}
+
+func TestCaptureToolRejectsUnauthenticated(t *testing.T) {
+	srv, _ := captureServer(t, capFakeValidator{err: errors.New("no jwt")}, nil)
+	resp := captureCall(t, srv, "", map[string]any{ // no Authorization
+		"context":  map[string]any{"harness": "x", "classification": "internal"},
+		"insights": []map[string]any{{"text": "a", "wing": "hyperguild", "hall": "facts"}},
+	})
+	require.NotNil(t, resp["error"])
+	assert.Contains(t, resp["error"].(map[string]any)["message"].(string), "authenticated principal")
+}
+
+func TestCaptureToolCallerCannotForgeOrigin(t *testing.T) {
+	// Body asserts sovereign harness, but the us-nexus JWT principal governs.
+	srv, _ := captureServer(t, capFakeValidator{subject: "claudeai-oauth"}, nil)
+	resp := captureCall(t, srv, "Bearer jwt", map[string]any{
+		"context":  map[string]any{"harness": "sovereign-soil", "classification": "confidential"},
+		"insights": []map[string]any{{"text": "secret", "wing": "client-seb", "hall": "facts"}},
+	})
+	require.NotNil(t, resp["error"])
+	assert.Contains(t, resp["error"].(map[string]any)["message"].(string), "sovereignty")
+}

skills/close-session/SKILL.md

@@ -0,0 +1,79 @@
+---
+name: close-session
+description: Disciplined end-of-session closeout for a Claude.ai chat before archiving it. Harvests the session's decisions, artifacts, and open threads and durably persists them to the brain MCP and the right Gitea repo so nothing is lost when context resets. Use this whenever the user signals they are wrapping up — phrases like "close this out", "let's wrap up", "before I archive", "session retro", "capture this before I go", "did we lose anything", or any end-of-session/handoff cue — even if they don't say the word "close". Also use when the user explicitly asks to retro, archive, or hand off a working session.
+---
+
+# close-session
+
+Capture a finishing Claude.ai work session into durable storage before the chat is archived and its context is lost. The goal is simple and load-bearing: **after this runs, a fresh session (or another agent) can reconstruct what was decided, what was shipped, and what is still open — without the original chat.**
+
+This skill is **batch**: one session in, findings out, done. Run the phases in order. Stop at any confirmation gate that says STOP.
+
+## Operating constraints (read first)
+
+- **Gitea owner is always `mathias`.** Never guess another owner.
+- **Ground-truth at HEAD before acting.** Issue bodies and doc references rot — stale hostnames, retired services, moved endpoints. Before closing/commenting on any issue, `gitea:issue_get` it fresh. Before asserting an infra fact, verify it; do not copy it from memory or from a stale issue body.
+- **Current infra truths** (verify rather than trust, but these are the known-good baseline): Gitea is `git.d-ma.be` (not `gitea.d-ma.be`). LiteLLM is `http://koala:30401/v1/` (public `https://llm-api.d-ma.be`); piguard runs NGINX Proxy Manager only — never reference `piguard:4000` or `koala:4000`. Identity provider is Authentik (Dex migration complete).
+- **Side-effects need a confirmation gate.** Closing issues and capturing to brain/Gitea/ai-sessions are real writes. Surface exactly what will happen and get a clear yes before doing it. Reads are free; writes are gated.
+- **Never fabricate.** If the session didn't produce a decision worth persisting, say so and skip that write. An empty-but-honest closeout beats an invented one.
+
+## Phase 1 — Harvest
+
+Reconstruct what actually happened this session from the conversation itself. Produce, in working memory:
+
+- **Decisions taken** — what was decided and the reasoning, not just the outcome.
+- **Artifacts produced** — issues filed/closed, PRs opened/merged, files committed, brain notes written, ADRs. Capture identifiers (issue numbers, PR numbers, paths, commit SHAs) as you go.
+- **Open threads** — what was deferred, what's blocked, what the next session should pick up.
+- **Generalizable learnings** — reusable patterns or footguns that would bite anyone again (these are brain-worthy; project status is not).
+
+Be honest about fidelity: a long session compresses harder at the start than the end. Flag anything you're reconstructing rather than certain of.
+
+## Phase 2 — Ground-truth Gitea state
+
+For every repo touched this session, get its true current state before proposing any change. `gitea:repo_status` (owner `mathias`) gives branches + open PRs + protection in one call. For each issue you intend to close, comment on, or reference: `gitea:issue_get` it fresh and compare to what the session assumed. Note any drift (closed-already, body rotted, renamed) — you'll surface it in Phase 3.
+
+Do not write anything in this phase. This is the read pass.
+
+## Phase 3 — Plan the issue changes
+
+Decide the issue actions: which to close (with closing comment), which to file (discovered-but-deferred work — token-budget gaps, recorded limitations, v2 follow-ups), which to comment on. Include the exact title/body for any new issue and the closing rationale for any close.
+
+These actions are **carried into the Phase 4 capture call** as `tickets[]` rather than executed here with direct `gitea:issue_*` calls — routing them through capture puts each one into the I5 audit record. (Closing an issue that needs a separate explanatory comment first is the one case to do directly; otherwise prefer the capture path.)
+
+## Phase 4 — Capture (one uniform call)
+
+Persist the session via a **single `capture` call** (the `brain:capture` MCP tool, live on the Claude.ai connector). Capture owns the writes server-side — insights → brain, action items → Gitea tickets, summary → ai-sessions — plus the I1 sovereignty gate, the I5 audit record, and the supersession/read-after-write discipline. The skill's job is to *assemble the payload*, not to write each store itself. Do NOT fall back to separate `gitea:file_write_branch` + `brain_write` steps unless `capture` is unreachable (see fallback below).
+
+**Assemble one payload:**
+
+- **`insights[]`** — the generalizable learnings from Phase 1 (decisions/failures worth re-reading). Each: `{text, wing, hall}`; add `supersede_slug` to revise a prior note in place instead of creating a duplicate. `hall` ∈ facts/decisions/failures/hypotheses/sources.
+- **`tickets[]`** — the issue actions from Phase 3: `{repo, action, ...}` where action ∈ create/close/comment. Owner is always `mathias` (server-forced).
+- **`summary`** — `{title, body, repos_touched}`. Capture writes it to `ai-sessions` and stamps `fidelity` in frontmatter. Body stays reconstructable: one-paragraph summary, decisions, key artifacts, open threads.
+- **`context`** — `{harness: "claudeai-chat", session_ref: <chatid8-or-slug>, fidelity: "live-capture", actor: "mathias", classification: <see gate below>}`.
+
+**THE CLASSIFICATION GATE (read before calling — this is where capture refuses).**
+Capture computes an **effective classification = the strictest across EVERY target it touches** (each insight's `wing`, each ticket's `repo`, and every entry in `summary.repos_touched`), then refuses if that effective level is `confidential` and the origin is us-nexus (claude.ai is us-nexus). Levels come from `classification.yaml` at the brain root (source of truth, #67), with the code defaults as the floor: `hyperguild`/`homelab` → internal; `client-*` → confidential; **anything untagged → confidential (fail-safe)**.
+- **Tagged `internal` today** (safe through claude.ai): wings `hyperguild`, `homelab`; repos `brain`, `ai-sessions`, `infra`, `hyperguild`, `homelab`, `tapir`, `agentsquad`, `jepa-fx-risk`, `swedsl`. Treat `classification.yaml` as authoritative — this list is a hint, not gospel.
+- Declare `context.classification: "internal"` for normal homelab work.
+- `summary.repos_touched`, insight `wing`s, and ticket `repo`s are classification INPUTS, not free-form metadata — every target must resolve `internal` or the whole capture escalates to `confidential` and the gate refuses via claude.ai. Listing the central homelab repos (incl. `brain`/`ai-sessions`) is now fine; they're tagged. The summary always lands in `ai-sessions` (internal), so the summary path itself never escalates.
+- If a session genuinely touched **`client-*` or otherwise-untagged** material, it cannot be captured through claude.ai — note that in the verdict rather than trying to force it.
+
+**GATE — dry-run first, then execute.**
+1. Call `capture` with `dry_run: true`. It validates the whole payload and returns the would-be receipt + `effective_classification`, writing nothing.
+2. **STOP. Show the dry-run receipt** (effective classification, the insights/tickets/summary that would land) and get explicit confirmation.
+3. On confirmation, call `capture` again with `dry_run: false`. Read the returned receipt: it is partial-aware (`errors[]`, per-item `ok`). Report exactly what landed.
+
+If `capture` is **unreachable** (tool not on the connector — e.g. a session that started before a deploy; a tool-list refresh usually fixes it): say so. Only then fall back to the legacy inline path (`gitea:file_write_branch` summary + `brain_write`/`brain_update` + `brain_get` confirm), and note in the verdict that the I5 audit record was NOT produced.
+
+## Phase 5 — Verdict
+
+Deliver a final "safe to archive" verdict in the chat. Either:
+
+- **SAFE TO ARCHIVE** — list what landed from the capture receipt (issues closed/filed with numbers, summary path, brain note ids/paths) so the trail is auditable. Then list anything still in the user's queue (e.g. a PR awaiting their merge, a decision owed next session).
+- **NOT YET** — name the specific gate that wasn't passed, the capture refusal reason, or the per-item error from the receipt, and what to do about it.
+
+Never claim safe-to-archive if the capture refused, any receipt item errored, or a gated confirmation was declined. The verdict is the skill's contract: if it says safe, the session can be lost without losing the work.
+
+## Why the gate and the single-call shape matter
+
+The whole point is durability across a context reset. The capture call is the one place a wrong payload would silently corrupt the record (close the wrong issue, escalate to a refusal, commit a half-truth), which is why it is dry-run-then-confirm. Routing everything through one `capture` keeps the supersession discipline, the read-after-write confirmation, and the I5 audit trail server-side — the skill never has to carry those rules itself, and every closeout is uniformly audited. Get the payload and the classification right and the skill does what it promises — nothing important is lost when the chat goes away.

specs/capture-bdd-spec.md

@@ -0,0 +1,248 @@
+# Capture capability — use-case & BDD specification
+
+**Status:** Decisions resolved 2026-06-22 (§4). Ready for implementation scoping. `capture` is a
+privileged cross-harness write path touching brain + Gitea + ai-sessions.
+**Tracks:** hyperguild #49.
+**Governed by:** `infra/docs/architecture/01-invariants.md` (I1–I5), the admissibility test in
+`00-synthesis-model.md`, and the distributed-consolidation shape mandated by
+`brain/wiki/homelab/decisions/no-centralized-cross-harness-observer-2026-06-17.md`.
+
+---
+
+## 1. Use-case (Clean Architecture form)
+
+**Name:** CaptureSession
+**Actor:** A harness acting on the user's behalf (claude.ai Chat/Cowork/Code/Design, Claude Code
+CLI, Crush, Pi, LLM Council, Agentsquad executor/reviewer) — or the user directly.
+**Goal:** Durably persist a finished session's valuable output — insights → brain, action items →
+Gitea tickets, optional summary → ai-sessions — with one uniform invocation, identical core
+behaviour across harnesses.
+
+**Primary success scenario (essential steps):**
+1. Caller assembles capture input (insights, tickets, optional summary) + context (harness,
+   session_ref, fidelity, actor, **data-classification**).
+2. System validates the whole request (fail-closed).
+3. System resolves **effective classification** (stricter of caller-declared and target-derived)
+   and the **server-derived harness origin** (from the authenticated principal). It checks the
+   **sovereignty gate** (I1): if effective classification is confidential AND the origin is a
+   non-sovereign (us-nexus) surface, the capture is **refused** before any write.
+4. System persists insights (write or supersede), tickets (create/close/comment), summary — each
+   best-effort, recording per-item outcome.
+5. System emits an **audit record** (I5) of who/what captured what, when, via which principal.
+6. System returns a structured, partial-aware receipt.
+
+**Architectural shape:** the *logic* is a shared use-case (`CaptureService`), invoked **per-harness
+against the caller's own credentials** (distributed consolidation — no high-degree observer node).
+A central authenticated relay endpoint exists ONLY as a fallback for harnesses that cannot run the
+use-case in-process (Crush/Pi/headless); the relay holds no standing visibility and retains nothing
+beyond the I5 audit log.
+
+---
+
+## 2. Invariant obligations (acceptance gates, not nice-to-haves)
+
+| Invariant | Obligation on `capture` |
+|---|---|
+| **I1 sovereign containment** | A confidential-classified session MUST NOT be captured through a us-nexus harness. Harness origin is **server-derived from the authenticated principal** (not caller-asserted). Classification uses **model (C)**: caller declares, server cross-checks the target's tag, **stricter wins**, mismatch logged. See §4.1–4.2. |
+| **I2 deliberate acceptance** | The *distributed-library* form opens no new acceptance. IF a central relay node is deployed, its cross-harness reach MUST be entered in `infra/docs/security-baseline.md` with Why-accepted / Revisit-if before it ships. |
+| **I3 GitOps reconcilability** | IF `capture` runs as a deployed service, its manifest lives under `infra/k3s/apps/**` (sovereign source, Flux-reconciled). No untracked runtime. |
+| **I4 decisions captured** | The distributed-vs-central decision and the intent-named-verb pattern are recorded (ADR + brain). |
+| **I5 auditability** | Every capture emits a request-level audit record (actor/principal, harness, items written, timestamp) to the alloy/loki substrate. **Classification-aware degradation** (§4.4): confidential + sink-down → hard-refuse; internal/public + sink-down → durable local buffer + ntfy + reconcile. Floor: refuse if nothing can record the audit. |
+
+---
+
+## 3. BDD scenarios (Gherkin)
+
+```gherkin
+Feature: Capture session value uniformly across harnesses
+  As an operator working across many AI harnesses
+  I want one uniform command to persist insights and file tickets
+  So that valuable session output is never lost and is always auditable
+
+  Background:
+    Given a brain store, a Gitea issue tracker, and an ai-sessions summary writer
+    And the caller is authenticated with a principal
+    And the session context declares a harness, a fidelity, and a data classification
+
+  # --- Core happy path ---
+  Scenario: Capture insights and tickets from a non-confidential session
+    Given a session classified as "internal"
+    And the capture input has 2 insights and 1 ticket to create
+    When capture is invoked
+    Then both insights are written to the brain and their ids and content hashes are returned
+    And the ticket is created in the named repo under owner "mathias"
+    And an audit record is emitted naming the principal, harness, and items written
+    And the receipt reports every item as ok
+
+  # --- I1: sovereignty gate (the load-bearing refusal) ---
+  # Harness origin is server-derived from the authenticated principal, never from context.harness.
+  Scenario: Refuse capture of a confidential session through a us-nexus harness
+    Given a session whose effective classification is "confidential"
+    And the authenticated principal resolves to a us-nexus harness origin
+    When capture is invoked
+    Then the capture is refused before any write
+    And no insight, ticket, or summary is persisted
+    And the refusal names the sovereignty invariant as the reason
+
+  Scenario: Allow capture of a confidential session through a sovereign harness
+    Given a session whose effective classification is "confidential"
+    And the authenticated principal resolves to a sovereign-soil harness origin
+    When capture is invoked
+    Then the capture proceeds and persists normally
+
+  Scenario: Ignore a caller-asserted harness label and use the server-derived origin
+    Given the request context asserts harness "sovereign-soil"
+    But the authenticated principal resolves to a us-nexus origin
+    And the session classification is "confidential"
+    When capture is invoked
+    Then the capture is refused
+    And the server-derived origin is used, not the asserted label
+    And the asserted-vs-derived discrepancy is logged as a security event
+
+  # --- I1: classification model (C) — stricter of declared vs target-derived wins ---
+  Scenario: Take the stricter classification when caller and target disagree
+    Given the caller declares classification "internal"
+    But the target wing/repo is tagged "confidential"
+    When capture is invoked
+    Then the effective classification is "confidential"
+    And the declared-vs-derived mismatch is logged as a security event
+    And the I1 gate is evaluated against "confidential"
+
+  Scenario: Honour a caller raising sensitivity above the target's tag
+    Given the caller declares classification "confidential"
+    And the target wing/repo is tagged "internal"
+    When capture is invoked
+    Then the effective classification is "confidential"
+    And the capture is gated as confidential
+
+  # --- Supersession + staleness discipline (reuses #45 / #47 resolution) ---
+  Scenario: Supersede a prior insight rather than duplicating it
+    Given an insight whose context names an existing note to supersede
+    When capture is invoked
+    Then the existing note is updated in place, not duplicated
+    And the prior content hash is recorded in the superseding note
+    And read-after-write confirmation uses a direct fetch, never a semantic query
+
+  # --- Validation: fail-closed ---
+  Scenario: Reject a malformed request before any write
+    Given a capture input with an invalid wing/hall or unknown repo
+    When capture is invoked
+    Then the request is rejected with a validation error
+    And nothing is written to the brain, Gitea, or ai-sessions
+
+  # --- Partial failure: best-effort + honest receipt ---
+  Scenario: Report partial success when one item fails mid-capture
+    Given a capture input with 2 insights and 1 ticket
+    And the second insight write will fail
+    When capture is invoked
+    Then the first insight and the ticket are persisted
+    And the second insight is reported as failed in the receipt
+    And no rollback is attempted
+    And the audit record reflects exactly what landed
+
+  # --- Dry run ---
+  Scenario: Preview a capture without writing
+    Given a valid capture input with dry_run true
+    When capture is invoked
+    Then the would-be receipt is returned
+    And nothing is written anywhere
+
+  # --- I5: auditability is classification-aware (confidential fails closed) ---
+  Scenario: Confidential capture hard-refuses when the central audit sink is down
+    Given the effective classification is "confidential"
+    And the central audit substrate (loki) cannot be written to
+    When capture is invoked
+    Then the capture is refused before any write
+    And the reason names the auditability invariant
+    # Confidential work must be centrally auditable at write time — no buffered exception.
+
+  Scenario: Internal capture degrades to a durable local buffer when the sink is down
+    Given the effective classification is "internal" or "public"
+    And the central audit substrate (loki) cannot be written to
+    When capture is invoked
+    Then the capture proceeds
+    And the audit record is written to a durable LOCAL fallback buffer
+    And an ntfy alert is emitted naming the degraded audit state
+    And the receipt flags that audit was buffered locally, not centrally recorded
+
+  Scenario: Locally buffered audit records reconcile to the central sink on recovery
+    Given internal-tier audit records were buffered locally during a sink outage
+    When the central audit substrate becomes reachable again
+    Then the buffered records are replayed to the central sink
+    And the local buffer is cleared only after confirmed central write
+
+  Scenario: Even internal capture refuses if neither sink nor local buffer can be written
+    Given the effective classification is "internal" or "public"
+    And neither the central sink nor the local fallback buffer can be written
+    When capture is invoked
+    Then the capture is refused
+    And the reason names the auditability invariant
+    # Degrade-and-warn has a floor: if NOTHING can record the audit, do not write.
+
+  # --- Summary fidelity (collision rule from the retro work) ---
+  Scenario: A richer-fidelity summary supersedes a thinner one for the same session
+    Given a summary already exists for session_ref X at fidelity "live-capture"
+    And a new summary arrives for session_ref X at fidelity "transcript-parse"
+    When capture is invoked
+    Then the transcript-parse summary supersedes the live-capture one
+    And the live-capture summary is not left as a contradicting duplicate
+```
+
+---
+
+## 4. Resolved decisions (2026-06-22)
+
+These were open questions at draft; resolved in the 2026-06-22 review session. Recorded here as
+binding design decisions for the build.
+
+1. **Classification trust — model (C): caller-declares + server-cross-checks, stricter wins.**
+   The caller declares `context.classification`; the server **independently derives** the target's
+   classification (from the target wing/repo's classification tag) and gates on the **stricter of
+   the two**. The caller can voluntarily *raise* sensitivity but can never *lower* it below the
+   target's floor. A declared-vs-derived **mismatch is logged as a security event** (I5).
+   - **Prerequisite (new build work):** a classification taxonomy (e.g. `public` /
+     `internal` / `confidential`) and a per-wing / per-repo classification tag the server can read.
+     This must exist before the I1 gate is load-bearing. Tracked as a sub-task of #49.
+     - **Implemented (#50):** taxonomy `public < internal < confidential` (ordered so "stricter wins"
+       is `max`) in `ingestion/internal/classification/`. Tags are read from an optional
+       `classification.yaml` at the brain root (`wings:` / `repos:` maps); absent entries fall to
+       built-in defaults (`client-*` → confidential; `hyperguild`/`homelab` → internal; everything
+       else → **confidential, fail-safe**). `Config.Derive(Target)` is the function the use-case
+       calls. See brain `wiki/hyperguild/decisions/capture-classification-taxonomy`.
+   - Rationale: composes with decision 2; fails safe; honours a caller flagging something *more*
+     sensitive than its destination. Pure caller-trust (A) was rejected — it makes the gate theatre.
+
+2. **Sovereign-harness determination — server-derived, not caller-asserted.**
+   "Is this harness us-nexus / sovereign?" is derived from the **authenticated principal/origin**
+   (the OAuth2 identity), never from `context.harness`. `context.harness` survives only as a
+   self-reported label for the audit log — descriptive telemetry, **never a gate input**. A control
+   keyed on an attacker-suppliable value is not a control.
+
+3. **Central relay — ships in v1, with the I2 ledger entry.**
+   The relay is required, not optional: claude.ai (Chat/Cowork/Design), Crush, Pi, and LLM Council
+   cannot run the use-case library in-process, and those are primary day-to-day surfaces. Deferring
+   the relay would ship a capability that doesn't work from the interfaces actually in use. Because
+   the relay is a (thin, no-standing-visibility, audit-only-retention) central node, its cross-harness
+   reach **must be entered in `infra/docs/security-baseline.md`** with Why-accepted / Revisit-if
+   **before it ships** (I2). That ledger entry is v1 work, not a follow-up.
+
+4. **Audit-sink-down — classification-aware: confidential fails closed, internal/public degrades.**
+   The posture inherits from the effective classification (decision 1), so there is one coherent
+   sensitivity model rather than a separate availability policy:
+   - **Confidential + central audit sink unreachable → hard-refuse.** No buffer, no proceed.
+     Confidential work must be centrally auditable *at write time*; "buffer and reconcile later"
+     introduces a buffer-integrity question (can a write tamper with its own pending audit record?)
+     that must not exist for confidential data. The simplicity of "refuse" is itself the assurance
+     asset — trivially true, nothing to poke holes in.
+   - **Internal / public + central sink unreachable → degrade-and-warn** with a durable local buffer
+     + ntfy alert + reconcile-on-recovery (the earlier Q4 design, now scoped to lower tiers). Keeps
+     capture available for your own homelab work during an observability outage; negligible risk
+     since the buffered record is still durable and the data isn't client-confidential.
+   - **Floor (all tiers):** if *nothing* — neither central sink nor (for internal/public) the local
+     buffer — can record the audit, capture **refuses**. No tier writes wholly un-audited.
+   - Rationale: matches assurance cost to data sensitivity, exactly as the I1/sovereignty model
+     does for placement. Presentable to a due-diligence client as "audit posture is
+     classification-aware: confidential fails closed, internal degrades gracefully" — which
+     demonstrates the judgment, not just a binary. Couples Q4 to Q1's classification machinery
+     (being built anyway) and removes the buffer-integrity rabbit hole for the only tier where it
+     mattered.

specs/capture-implementation-report.md

@@ -0,0 +1,116 @@
+# Capture capability — implementation report (as-built)
+
+**Status:** Shipped 2026-06-23, tagged `v0.11.0`. Epic hyperguild #49 (sub-issues #50–#55) closed.
+**Spec:** `specs/capture-bdd-spec.md` (the design contract this implements).
+**Governed by:** `infra/docs/architecture/01-invariants.md` (I1–I5) + the I2 acceptance ledger entry in `infra/docs/security-baseline.md`.
+
+This document records what was actually built, where it lives, how it maps to the spec, and what was deferred — for onboarding and future audit. It does not restate the design rationale (see the spec and the linked brain entries).
+
+---
+
+## 1. Outcome
+
+One uniform capture capability — insights → brain, action items → Gitea tickets, optional summary → ai-sessions — reachable identically from every harness:
+
+- **In-process / direct-REST harnesses** (Claude Code CLI, Agentsquad, claude.ai Code, headless): `POST /capture` on the brain server.
+- **MCP-native harnesses** (claude.ai Chat/Cowork/Design, Crush, Pi, LLM Council): the `capture` MCP tool, reached over the existing `/mcp` OAuth connector.
+
+Both doors call the **same** `CaptureService`; only the transport and credential assembly differ. The persistence behaviour (validation, classification, I1 gate, orchestration, I5 audit, partial receipt) is written once.
+
+---
+
+## 2. Architecture (as-built)
+
+```
+                 POST /capture (REST)          capture MCP tool
+                 capturehttp.Handler           mcp.Server.brainCapture
+                          \                          /
+                           \   (auth → principal →  /
+                            \   origin; decode)    /
+                             v                    v
+                        capture.CaptureService (use-case, pure)
+            ┌───────────────┬───────────────┬──────────────┬───────────────┐
+        BrainStore     IssueTracker    SummaryWriter   ClassificationPolicy  AuditSink
+        brainstore.    gitea.Client    (nil today)     classification.Config  audit.Degrading
+        Store          (REST)                                                 Sink / SlogSink
+        │                                                                     │
+        api.WriteNote/UpdateNote/ReadNote (#45)                       LokiCentral + FileBuffer
+        + wing index + auto-tunnel + graph re-index                  + NtfyNotifier + Reconcile
+```
+
+- **`internal/capture/`** — the use-case + ports + entities. Pure; no I/O. Owns validation (fail-closed), effective-classification resolution (stricter wins), the **I1 sovereignty gate**, best-effort orchestration, the **two-phase I5 audit** (Reserve before writes / Record after), and the partial-aware receipt.
+- **`internal/brainstore/`** — concrete `BrainStore` wrapping the #45 `api` primitives + wiki upkeep (wing `_index`, auto-tunnel, graph re-index). The MCP `brain_write`/`brain_update`/`brain_get` handlers were re-pointed at it: one implementation, not two.
+- **`internal/classification/`** — `public < internal < confidential` taxonomy + per-wing/repo tags from an optional `classification.yaml`; fail-safe to confidential.
+- **`internal/gitea/`** — `IssueTracker` over the Gitea REST API; owner forced to `mathias`; token only in the Authorization header.
+- **`internal/capturehttp/`** — the REST adapter + the shared `Authenticate` / `DecodeRequest` / `OriginResolver` (also used by the MCP tool).
+- **`internal/audit/`** — `SlogSink` (default) and the `DegradingSink` (loki + durable `FileBuffer` + `NtfyNotifier` + `Reconcile`).
+- **`internal/mcp/`** — the `capture` relay tool + principal threading (re-derives the caller's principal from the Bearer header the chassis middleware discards).
+
+---
+
+## 3. Sub-issue → PR map
+
+| Sub | Issue | PR(s) | Delivered |
+|-----|-------|-------|-----------|
+| 49a | #50 | #56 | classification taxonomy + per-wing/repo tags (fail-safe to confidential) |
+| 49b | #51 | #57 | `CaptureService` use-case + ports + entities; `BrainStore` extraction (MCP re-pointed) |
+| 49c | #52 | #58 | Gitea `IssueTracker` (owner forced mathias; token never logged) |
+| 49d | #53 | #59 | `POST /capture` REST + OAuth2 + I1 sovereignty gate (server-derived origin) |
+| 49e | #54 | #60 | I5 audit path + classification-aware degradation (loki + buffer + reconcile) |
+| 49f | #55 | #61, infra #151 (ledger), #152 (deploy) | MCP `capture` relay tool + I2 ledger + I3 deploy |
+
+Predecessor: #45 (`brain_update`/`brain_get` verbs, PR #46) — the read-after-write contract capture reuses.
+
+---
+
+## 4. Invariant compliance
+
+| Inv | How satisfied |
+|-----|---------------|
+| **I1** sovereign containment | Effective classification = stricter(caller-declared, target-derived #50). Origin is **server-derived from the authenticated principal**, never `context.harness`. Confidential + us-nexus origin → refused before any write; refusal audited. Asserted-vs-derived mismatch → security event. |
+| **I2** deliberate acceptance | The relay's cross-harness reach is recorded in `infra/docs/security-baseline.md` with six containment properties + Revisit-if, **merged before relay code shipped** (infra #151). |
+| **I3** GitOps reconcilability | Env + `gitea-api-token` ExternalSecret under `infra/k3s/apps/supervisor/`, Flux-reconciled; image bumped by CD. No untracked runtime. |
+| **I5** auditability | Every capture emits a request-level audit record. Classification-aware degradation: confidential + sink-down → hard-refuse; internal/public + sink-down → durable local buffer + ntfy + reconcile-on-recovery; floor → refuse if nothing can record. |
+
+---
+
+## 5. Operational reference (env)
+
+Set on the `ingestion` deployment (`infra/k3s/apps/supervisor/ingestion-deployment.yaml`):
+
+| Env | Purpose | Notes |
+|-----|---------|-------|
+| `BRAIN_GITEA_URL` / `BRAIN_GITEA_TOKEN` | enables the `IssueTracker` → gates `/capture` + the MCP tool | token from 1P `DMABE_GITEA_API_TOKEN` via ESO; unset ⇒ capture disabled |
+| `BRAIN_LOKI_URL` | activates the `DegradingSink` | unset ⇒ `SlogSink` (audit to stdout → alloy → loki; no refuse/buffer semantics) |
+| `BRAIN_NTFY_URL` / `BRAIN_NTFY_TOKEN` | degraded-state alerts | optional |
+| `BRAIN_CAPTURE_SOVEREIGN_PRINCIPALS` | JWT subjects treated as sovereign-soil | comma-separated; static-token caller is always sovereign; unknown JWT ⇒ us-nexus (fail safe) |
+| `BRAIN_AUDIT_RECONCILE_INTERVAL` | buffer→loki replay tick | default 60s |
+
+The audit buffer lives at `<brain>/.audit-buffer/capture.jsonl` on the brain hostPath (nodeSelector-pinned to koala) — durable across restart without a separate PV.
+
+---
+
+## 6. Tests
+
+67 test functions across the six packages. Coverage maps to the spec's Gherkin: happy path, supersede-not-duplicate, fail-closed validation, partial-failure receipt, dry-run, stricter-classification-wins, I1 confidential-via-us-nexus-refused / via-sovereign-allowed / asserted-label-ignored / caller-cannot-forge-origin, I5 confidential-refuse / internal-buffer / floor-refuse / reconcile / buffer-survives-restart, and the MCP relay tool (forwards, preserves principal, unauth rejected). `task check` green.
+
+---
+
+## 7. Deferred (not in this epic)
+
+Tracked here so they aren't lost; file as issues when picked up:
+
+- **SKILL veneer** — the `close-session` SKILL becomes the claude.ai trigger/harvest layer that calls capture.
+- **Per-harness token provisioning** for Crush / Pi / LLM Council (claude.ai is done via the existing `/mcp` connector).
+- **Harvest adapters** — transcript-parse vs chat-memory-reconstruct vs agent-runlog, each assembling capture args at its own fidelity.
+- **`SummaryWriter` impl** — ai-sessions summary persistence (the port + path logic exist; the concrete writer is nil today, so a request with a summary fails that one item).
+
+---
+
+## 8. Brain learnings
+
+- `wiki/hyperguild/decisions/capture-classification-taxonomy`
+- `wiki/hyperguild/decisions/gate-on-server-derived-signals-fail-safe`
+- `wiki/hyperguild/decisions/two-phase-reserve-record-audit-gate`
+- `wiki/hyperguild/failures/mcp-bearer-middleware-discards-principal`
+- `wiki/hyperguild/facts/brain-mcp-embeddings-out-of-band-sync` (from #45, the predecessor)