fix(capture): name what escalated the classification in an I1 refusal (#91)

infra#265 reported "capture with a tickets array fails": 20 tickets
errored, 5 errored, the caller fell back to 20 individual issue_create
calls and filed a bug against the array.

The array was never the failing dimension. Every ticket in that batch
targeted a client repo, and the I1 sovereignty gate refuses a
confidential capture through a us-nexus origin at ANY length — reproduced
live today against brain-mcp: length 1 succeeds for an internal repo,
length 20 validates clean, and a single ticket targeting
trucker-ecommerce is refused.

What made it look like an array bug is that the refusal named neither the
offending target nor the fact that a policy said no:

    capture refused by I1 sovereignty gate: effective classification
    confidential through us-nexus origin

With twenty tickets a caller cannot tell which repo tripped it, so
"the array is broken" is a reasonable conclusion from the evidence
available. resolveClassification now also returns the targets carrying
the effective level, and the refusal names them:

    ... through us-nexus origin (required by: trucker-ecommerce)

Only targets that actually reach the effective level are named — at
twenty tickets, listing the innocent ones hides the one that matters —
and a caller who declared confidential themselves is told exactly that,
because "you asked for this" and "a repo you touched required it" call
for different fixes.

Regression tests at length 1 and 20 pin the array path that was never
broken, and a third pins per-item partial success: infra#265 asked "if
ticket 3 of 5 fails, what happened to 1 and 2?" — they land, and the
receipt says so per item.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BeAp5LTscnz2W7Ubt4eJ6m

.dispatch-allow

@@ -1,2 +0,0 @@
-# Presence of this file marks this repo as opt-in for headless dispatch.
-# See dispatch#3.

README.md

@@ -5,11 +5,6 @@ Instead of letting Claude Code do whatever it wants, hyperguild enforces structu
 workflows (TDD red/green/refactor), logs every session, and accumulates learnings
 into a searchable brain.
 
-**This repo is also where `brain-mcp` lives** — the MCP server at
-`brain-mcp.d-ma.be` that `brain_query`, `brain_write`, `brain_read`, `brain_edit`
-and `capture` are served from. It is not a separate deployable; see
-[Where brain-mcp lives](#where-brain-mcp-lives).
-
 ## Hypothesis
 
 > We believe routing skill tasks through local models, backed by brain context,
@@ -25,7 +20,7 @@ usage, the fast-model routing path should be reconsidered.
 
 **hyperguild = Claude Code + MCP.** This is a supervisor for Claude Code sessions specifically.
 For multi-agent orchestration (OpenCode + LiteLLM, executor/reviewer pipelines), see
-[agentsquad](https://git.d-ma.be/mathias/agentsquad) — a separate harness for a different
+[agentsquad](http://gitea.d-ma.be/mathias/agentsquad) — a separate harness for a different
 orchestration model. Skills (mathias/skills) are shared between both.
 
 ## How it works
@@ -49,73 +44,6 @@ brain/
 └── knowledge/      — legacy flat notes (migration pending: hyperguild#22)
 ```
 
-## Where brain-mcp lives
-
-`brain-mcp` is served from **`ingestion/internal/mcp`** in this repo, at
-**`brain-mcp.d-ma.be`**. It is a component *inside* the `ingestion` service, not
-a standalone deployable — one pod in the `supervisor` namespace serves the MCP
-endpoint, the REST API, and the claudewatcher together.
-
-| You are looking for | It is here |
-|---|---|
-| The MCP tool surface (`brain_query`, `brain_write`, `brain_read`, `brain_edit`, `capture`, …) | `ingestion/internal/mcp` |
-| The HTTP/REST API (`/query`, `/write`, `/ingest`) | `ingestion/internal/api` |
-| Session ingestion from Claude Code transcripts | `ingestion/internal/claudewatcher` |
-| The brain *content* (notes, wings, halls) | [`mathias/brain`](https://git.d-ma.be/mathias/brain) — a separate repo |
-| Deployment manifests | `config/supervisor` |
-
-### Why it is not its own repo
-
-Asked and decided in [#91](https://git.d-ma.be/mathias/hyperguild/issues/91)
-(part 2). `internal/mcp` imports 17 of ingestion's other internal packages and
-has exactly one importer — it is the MCP facade over the service's own
-internals, so "move it out" resolves to renaming `ingestion`, publishing 17
-packages as a shared library, or maintaining a shim. The discoverability problem
-that prompted the question is answered by naming it here instead.
-
-Full reasoning, including the reversal trigger: brain
-`wiki/hyperguild/decisions/brain-mcp-stays-in-ingestion-fix-discoverability-by-name`.
-
-## Ingest revises, it does not overwrite
-
-Re-ingesting a source **merges into the page already on disk** rather than
-replacing it. Previously the write was unconditional, so a second ingest of the
-same source discarded everything accumulated since — including hand-written
-sections.
-
-The merge is deliberately asymmetric in the existing page's favour:
-
-| On the page | In the fresh extraction | Result |
-|---|---|---|
-| a section | the same section | **the on-disk version wins** |
-| — | a new section | added |
-| a bullet list (`Sources`, `Key Claims`, …) | more bullets | unioned, no duplicates |
-| an append section (`Open Questions`, `Updates`, …) | more lines | only genuinely new lines appended |
-| frontmatter | frontmatter | **the on-disk frontmatter wins** |
-
-So an extraction can add to a note but never silently rewrite what a human put
-there, which is what makes it safe to run on every ingest rather than behind a
-review gate.
-
-Re-ingesting unchanged content is **byte-identical** — no diff, so brain-sync
-does not commit noise that hides real edits.
-
-Two fields are **generator-owned** and do get refreshed on a revise:
-`last_updated` and `source_hash`. Everything else on disk wins. The boundary is
-an explicit allowlist, so a field nobody has thought about stays human-owned.
-
-## Re-ingesting an unchanged source is skipped
-
-Ingest stores `source_hash` — sha256 of the ingested **body**, frontmatter
-excluded — on the source page. A later ingest of the same source compares it
-first and skips extraction entirely when it matches, reporting the skip rather
-than doing it silently.
-
-Body-only is deliberate: a re-crawl that stamps a new fetch date has not changed
-the source, and treating that as drift would re-extract the corpus every time a
-crawler ran. A missing or unreadable hash always means "extract" — a missed skip
-costs one extraction, a wrong skip loses an update.
-
 ## Phase 1 tools (available now)
 
 | Tool | What it does |
@@ -130,7 +58,7 @@ costs one extraction, a wrong skip loses an update.
 | `tier` | Returns the current connectivity tier (1=cloud, 2=LAN, 3=offline) |
 
 > **Note:** `tdd_red/green/refactor` and `spec` were retired in Plan 7 (2026-05-12).
-> They are now SKILL.md files in [mathias/skills](https://git.d-ma.be/mathias/skills).
+> They are now SKILL.md files in [mathias/skills](http://gitea.d-ma.be/mathias/skills).
 
 ## Connect a project
 
@@ -219,7 +147,7 @@ The routing pod selects models per skill call based on historical pass rate:
 
 ## Open issues
 
-See [issues](https://git.d-ma.be/mathias/hyperguild/issues) — key open items:
+See [issues](http://gitea.d-ma.be/mathias/hyperguild/issues) — key open items:
 
 - **#25** — skills platform overhaul (audit first, then lazy loading + brain feedback loop)
 - **#24** — reduce context burn from skill listing

ingestion/cmd/server/main.go

@@ -144,16 +144,6 @@ func envInt(key string, fallback int) int {
 	return fallback
 }
 
-// buildNotifier returns the ntfy notifier, or a nil interface when
-// BRAIN_NTFY_URL is unset. A nil *interface* (not a typed-nil) is required so
-// DegradingSink/Reconcile and the governance observer skip it cleanly.
-func buildNotifier() audit.Notifier {
-	if n := audit.NewNtfyNotifier(os.Getenv("BRAIN_NTFY_URL"), os.Getenv("BRAIN_NTFY_TOKEN")); n != nil {
-		return n
-	}
-	return nil
-}
-
 // 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;
@@ -171,7 +161,12 @@ func buildAuditSink(ctx context.Context, brainDir string, logger *slog.Logger) c
 		logger.Error("capture audit buffer init", "err", err)
 		os.Exit(1)
 	}
-	notifier := buildNotifier()
+	// 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()))
@@ -495,13 +490,7 @@ func main() {
 		// 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)
-		// hyperguild#97: a governance-file rewrite gets the same trail a
+		logger.Info("capture enabled (REST + MCP tool)", "sovereign_principals", len(sovereign))
-		// capture already gets, plus an out-of-band alert. Wired here because
-		// brain_edit_root needs the capture plumbing anyway — that is what
-		// re-derives the static principal its gate checks.
-		mcpSrv.WithGovernanceObserver(auditSink, buildNotifier())
-		logger.Info("capture enabled (REST + MCP tool)", "sovereign_principals", len(sovereign),
-			"governance_observer", true)
 	} else {
 		logger.Info("capture endpoint disabled (BRAIN_GITEA_TOKEN unset)")
 	}

ingestion/internal/api/handler.go

@@ -12,7 +12,6 @@ import (
 	"time"
 
 	"github.com/mathiasbq/hyperguild/ingestion/internal/brain"
-	"github.com/mathiasbq/hyperguild/ingestion/internal/claim"
 	"github.com/mathiasbq/hyperguild/ingestion/internal/extract"
 	"github.com/mathiasbq/hyperguild/ingestion/internal/pipeline"
 	"github.com/mathiasbq/hyperguild/ingestion/internal/search"
@@ -153,24 +152,15 @@ func writeHallNote(brainDir string, opts WriteNoteOptions) (string, error) {
 	if err != nil {
 		return "", err
 	}
+	if err := os.MkdirAll(filepath.Dir(dest), 0o755); err != nil {
+		return "", fmt.Errorf("create hall dir: %w", err)
+	}
+
 	existingFields, body := splitFrontmatter(opts.Content)
 	existingByKey := make(map[string]frontmatterField, len(existingFields))
 	for _, f := range existingFields {
 		existingByKey[f.key] = f
 	}
-
-	// Validate the claim-property envelope BEFORE creating the directory, so a
-	// rejected write leaves nothing behind — not even an empty hall dir
-	// (brain#21). Fail closed: a value outside the enum is worse than an absent
-	// one, because a lint skips what it cannot parse and the note then reads as
-	// classified while nothing acts on it.
-	if err := claim.ValidateEnvelope(scalarValues(existingFields)); err != nil {
-		return "", fmt.Errorf("claim envelope: %w", err)
-	}
-
-	if err := os.MkdirAll(filepath.Dir(dest), 0o755); err != nil {
-		return "", fmt.Errorf("create hall dir: %w", err)
-	}
 	emitted := make(map[string]bool, 6)
 
 	var fm strings.Builder
@@ -228,25 +218,6 @@ func writeHallNote(brainDir string, opts WriteNoteOptions) (string, error) {
 	return filepath.ToSlash(rel), nil
 }
 
-// scalarValues flattens frontmatter fields to key -> scalar value for
-// validation. Multi-line values (lists, nested blocks) yield the text after
-// the colon on the first line, which is empty for a list — correct here,
-// since every claim-property field is a scalar enum.
-func scalarValues(fields []frontmatterField) map[string]string {
-	out := make(map[string]string, len(fields))
-	for _, f := range fields {
-		if len(f.lines) == 0 {
-			continue
-		}
-		_, value, found := strings.Cut(f.lines[0], ":")
-		if !found {
-			continue
-		}
-		out[f.key] = strings.TrimSpace(value)
-	}
-	return out
-}
-
 // frontmatterField is one top-level YAML key from a frontmatter block,
 // along with its raw line and any indented continuation lines (e.g. a
 // bulleted list value spanning multiple lines).

ingestion/internal/api/handler_test.go

@@ -440,60 +440,3 @@ func TestIngestPath_Directory(t *testing.T) {
 	require.True(t, ok, "pages must be an array")
 	assert.NotEmpty(t, pagesSlice)
 }
-
-// --- brain#21: claim-property envelope on the write path -------------------
-
-func TestWriteNote_PreservesClaimEnvelopeVerbatim(t *testing.T) {
-	// writeHallNote already passes unknown keys through; this pins that
-	// behaviour for the envelope specifically, so a future refactor of the
-	// merge loop cannot silently drop it.
-	dir := t.TempDir()
-
-	rel, err := api.WriteNote(dir, api.WriteNoteOptions{
-		Content: "---\nhalf_life: durable\napplies: universal\nclaim_provenance: asserted\n---\n\nA durable claim.\n",
-		Wing:    "homelab",
-		Hall:    "decisions",
-	})
-	require.NoError(t, err)
-
-	got, err := os.ReadFile(filepath.Join(dir, filepath.FromSlash(rel)))
-	require.NoError(t, err)
-	assert.Contains(t, string(got), "half_life: durable")
-	assert.Contains(t, string(got), "applies: universal")
-	assert.Contains(t, string(got), "claim_provenance: asserted")
-}
-
-func TestWriteNote_RejectsInvalidClaimEnvelopeAndWritesNothing(t *testing.T) {
-	// Fail closed: a value outside the enum must not land. A lint skips what
-	// it cannot parse, so an unvalidated write produces a note that reads as
-	// classified while nothing acts on it.
-	dir := t.TempDir()
-
-	_, err := api.WriteNote(dir, api.WriteNoteOptions{
-		Content:  "---\nhalf_life: forever\nclaim_provenance: asserted\n---\n\nBody.\n",
-		Filename: "bad-envelope",
-		Wing:     "homelab",
-		Hall:     "facts",
-	})
-	require.Error(t, err)
-	assert.Contains(t, err.Error(), "half_life")
-
-	_, statErr := os.Stat(filepath.Join(dir, "wiki/homelab/facts/bad-envelope.md"))
-	assert.True(t, os.IsNotExist(statErr), "a rejected write must leave no file behind")
-}
-
-func TestWriteNote_RejectsClaimFieldWithoutProvenance(t *testing.T) {
-	dir := t.TempDir()
-
-	_, err := api.WriteNote(dir, api.WriteNoteOptions{
-		Content:  "---\napplies: homelab\n---\n\nBody.\n",
-		Filename: "no-provenance",
-		Wing:     "homelab",
-		Hall:     "facts",
-	})
-	require.Error(t, err)
-	assert.Contains(t, err.Error(), "claim_provenance")
-
-	_, statErr := os.Stat(filepath.Join(dir, "wiki/homelab/facts/no-provenance.md"))
-	assert.True(t, os.IsNotExist(statErr))
-}

ingestion/internal/claim/claim.go

@@ -1,98 +0,0 @@
-// Package claim validates the claim-property frontmatter that says when and
-// where a note's claim holds, and who decided that (brain#21).
-//
-// Two families were designed together and land separately. This is the
-// applicability envelope:
-//
-//	half_life:        volatile | seasonal | durable   — how fast it decays
-//	applies:          local | homelab | universal     — how widely it holds
-//	claim_provenance: asserted | inferred             — who set the above
-//
-// The strength family (confidence, contested) follows once the ingest-time
-// contradiction detector exists to populate it.
-//
-// Why the envelope is validated rather than merely accepted: a value outside
-// the enum is worse than an absent one. A lint skips what it cannot parse, so
-// the note reads as classified while nothing acts on it — the field becomes
-// decoration that suppresses the very review it was added to trigger.
-//
-// Why `applies` and not `scope`: `scope:` has been in use since brain#5 for
-// glossary terms (`homelab-core`, `project:<repo>`) — a disjoint value space
-// on the same key. The shipped schema keeps the name; this one takes another.
-package claim
-
-import (
-	"fmt"
-	"strings"
-)
-
-// Field names, exported so writers and lints agree on the spelling.
-const (
-	FieldHalfLife   = "half_life"
-	FieldApplies    = "applies"
-	FieldProvenance = "claim_provenance"
-)
-
-var (
-	halfLives   = []string{"volatile", "seasonal", "durable"}
-	appliesTo   = []string{"local", "homelab", "universal"}
-	provenances = []string{"asserted", "inferred"}
-)
-
-// ValidateEnvelope checks the envelope fields of one note's frontmatter.
-//
-// Absent fields are valid: the envelope is opt-in for new writes, and a
-// corpus-wide backfill is deliberately out of scope (brain#21) — inferring
-// 1113 notes' properties in bulk has the same failure mode as the extraction
-// pass that produced 28 wrong wikilinks out of 67.
-func ValidateEnvelope(fm map[string]string) error {
-	halfLife, hasHalfLife := present(fm, FieldHalfLife)
-	applies, hasApplies := present(fm, FieldApplies)
-	prov, hasProv := present(fm, FieldProvenance)
-
-	if hasHalfLife {
-		if err := oneOf(FieldHalfLife, halfLife, halfLives); err != nil {
-			return err
-		}
-	}
-	if hasApplies {
-		if err := oneOf(FieldApplies, applies, appliesTo); err != nil {
-			return err
-		}
-	}
-	if hasProv {
-		if err := oneOf(FieldProvenance, prov, provenances); err != nil {
-			return err
-		}
-	}
-
-	// The field and its provenance travel together or not at all. A value
-	// whose author is unknown cannot be trusted differently from one Mathias
-	// asserted, which is how an inferred guess hardens into accepted fact.
-	switch {
-	case (hasHalfLife || hasApplies) && !hasProv:
-		return fmt.Errorf("%s is required when %s or %s is set",
-			FieldProvenance, FieldHalfLife, FieldApplies)
-	case hasProv && !hasHalfLife && !hasApplies:
-		return fmt.Errorf("%s is set but neither %s nor %s is",
-			FieldProvenance, FieldHalfLife, FieldApplies)
-	}
-	return nil
-}
-
-// present reports a trimmed field value and whether it was set to anything
-// non-empty. A key written with an empty value is treated as absent rather
-// than as an error: that is a caller emitting a placeholder, not asserting.
-func present(fm map[string]string, key string) (string, bool) {
-	v := strings.TrimSpace(fm[key])
-	return v, v != ""
-}
-
-func oneOf(field, value string, allowed []string) error {
-	for _, a := range allowed {
-		if a == value {
-			return nil
-		}
-	}
-	return fmt.Errorf("%s: %q is not one of %s", field, value, strings.Join(allowed, ", "))
-}

ingestion/internal/claim/claim_test.go

@@ -1,89 +0,0 @@
-// Package claim_test covers the claim-property envelope (brain#21).
-package claim_test
-
-import (
-	"testing"
-
-	"github.com/mathiasbq/hyperguild/ingestion/internal/claim"
-	"github.com/stretchr/testify/assert"
-	"github.com/stretchr/testify/require"
-)
-
-func TestValidateEnvelope(t *testing.T) {
-	tests := []struct {
-		name    string
-		fm      map[string]string
-		wantErr string
-	}{
-		{
-			name: "absent is fine — the fields are opt-in on new writes",
-			fm:   map[string]string{"wing": "homelab", "hall": "facts"},
-		},
-		{
-			name: "complete envelope with provenance",
-			fm: map[string]string{
-				"half_life": "durable", "applies": "universal", "claim_provenance": "asserted",
-			},
-		},
-		{
-			name: "inferred provenance is equally valid — it just must be stated",
-			fm: map[string]string{
-				"half_life": "volatile", "applies": "local", "claim_provenance": "inferred",
-			},
-		},
-		{
-			// A value nobody can act on is worse than no value: a lint
-			// silently skips it, so the note looks classified and isn't.
-			name:    "unknown half_life value",
-			fm:      map[string]string{"half_life": "forever", "claim_provenance": "asserted"},
-			wantErr: `half_life: "forever" is not one of volatile, seasonal, durable`,
-		},
-		{
-			name:    "unknown applies value",
-			fm:      map[string]string{"applies": "galaxy", "claim_provenance": "asserted"},
-			wantErr: `applies: "galaxy" is not one of local, homelab, universal`,
-		},
-		{
-			// brain#21: a value a model inferred must never be
-			// indistinguishable from one Mathias asserted. Writing the field
-			// without saying who set it is exactly that laundering.
-			name:    "envelope field without provenance",
-			fm:      map[string]string{"half_life": "durable"},
-			wantErr: "claim_provenance is required when half_life or applies is set",
-		},
-		{
-			name:    "applies without provenance",
-			fm:      map[string]string{"applies": "homelab"},
-			wantErr: "claim_provenance is required when half_life or applies is set",
-		},
-		{
-			name:    "unknown provenance value",
-			fm:      map[string]string{"half_life": "durable", "claim_provenance": "probably"},
-			wantErr: `claim_provenance: "probably" is not one of asserted, inferred`,
-		},
-		{
-			// Provenance alone says who set fields that aren't there.
-			name:    "provenance without any envelope field",
-			fm:      map[string]string{"claim_provenance": "asserted"},
-			wantErr: "claim_provenance is set but neither half_life nor applies is",
-		},
-		{
-			// The glossary wing has used scope: homelab-core since #5. The
-			// envelope deliberately does NOT claim that key (brain#21).
-			name: "glossary scope is untouched",
-			fm:   map[string]string{"scope": "homelab-core", "term": "koala"},
-		},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			err := claim.ValidateEnvelope(tt.fm)
-			if tt.wantErr == "" {
-				assert.NoError(t, err)
-				return
-			}
-			require.Error(t, err)
-			assert.Contains(t, err.Error(), tt.wantErr)
-		})
-	}
-}

ingestion/internal/mcp/brain_update_test.go

@@ -165,7 +165,7 @@ func TestBrainUpdateReembedsNewContent(t *testing.T) {
 	ctx := context.Background()
 
 	callResult(t, toolCall(t, srv, "brain_write", map[string]any{
-		"content":  "# Note\n\nthe OLD distinctive payload\n",
+		"content": "# Note\n\nthe OLD distinctive payload\n",
 		"filename": "n", "wing": "a", "hall": "facts",
 	}))
 

ingestion/internal/mcp/handlers.go

@@ -14,7 +14,6 @@ import (
 	"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/notes"
 	"github.com/mathiasbq/hyperguild/ingestion/internal/pipeline"
 	"github.com/mathiasbq/hyperguild/ingestion/internal/search"
 	"github.com/mathiasbq/hyperguild/ingestion/internal/session"
@@ -98,8 +97,6 @@ func (s *Server) tools() []map[string]any {
 				"slug":     str("optional target slug; defaults to filename minus date prefix"),
 			}),
 		},
-		noteToolDescriptors()[0],
-		noteToolDescriptors()[1],
 		{
 			"name":        "brain_tunnel",
 			"description": "Create an explicit bidirectional [[wikilink]] between two notes in different wings. Idempotent.",
@@ -323,15 +320,6 @@ func (s *Server) brainGet(ctx context.Context, args json.RawMessage) (json.RawMe
 	if target == "" {
 		return nil, fmt.Errorf("id or path is required")
 	}
-	// Containment: the store resolves any brain-relative path, and
-	// parseFrontmatter returns the WHOLE file as body when there is no
-	// frontmatter fence — so without this, brain_get reads verbatim session
-	// transcripts under archive/ and sessions/, which BM25 never indexes and
-	// which nobody therefore thinks of as reachable. Same allowlist as
-	// brain_read (brain#4).
-	if _, err := notes.Resolve(s.brainDir, target, notes.ScopeNotes); err != nil {
-		return nil, err
-	}
 	note, err := s.store.Get(ctx, target)
 	if err != nil {
 		return nil, err

ingestion/internal/mcp/server.go

@@ -49,8 +49,6 @@ type rpcError struct {
 // Server handles MCP JSON-RPC over HTTP for the ingestion service.
 type Server struct {
 	brainDir  string
-	govAudit  capture.AuditSink
-	govNotify govNotifier
 	pipeline  pipeline.Config
 	llm       pipeline.CompleteFunc
 	answerLLM pipeline.CompleteFunc // nil = brain_answer and brain_classify unavailable
@@ -277,15 +275,6 @@ func (s *Server) handleCall(ctx context.Context, name string, args json.RawMessa
 		return s.brainPromote(ctx, args)
 	case "capture":
 		return s.brainCapture(ctx, args)
-	case "brain_read":
-		return s.brainRead(ctx, args)
-	case "brain_edit":
-		return s.brainEdit(ctx, args)
-	case "brain_edit_root":
-		// Dispatches but is intentionally absent from tools/list — see
-		// tools_notes.go for why a governance-file editor must not be
-		// discoverable by a model.
-		return s.brainEditRoot(ctx, args)
 	case "brain_index":
 		return s.brainIndex(ctx, args)
 	case "brain_tunnel":

ingestion/internal/mcp/server_test.go

@@ -59,7 +59,6 @@ func TestServerToolsList(t *testing.T) {
 	assert.ElementsMatch(t, []string{
 		"brain_query", "brain_write", "brain_update", "brain_get",
 		"brain_pending", "brain_promote",
-		"brain_read", "brain_edit",
 		"brain_tunnel",
 		"brain_ingest_raw", "brain_ingest",
 		"brain_answer", "brain_classify", "brain_graph", "brain_context",
@@ -70,13 +69,6 @@ func TestServerToolsList(t *testing.T) {
 	// a caller verb is cognitive load with no decision behind it (ADR-0012
 	// rule 4, #78). The capability stays reachable — see the admin test below.
 	assert.NotContains(t, names, "brain_index")
-
-	// brain_edit_root is de-surfaced for a sharper reason than brain_index:
-	// brain content is ingested from the outside world and reaches a model's
-	// context, so a listed governance-file editor would be a durable
-	// prompt-injection path — one poisoned page rewriting the CLAUDE.md a
-	// .dispatch-allow agent later loads as instructions.
-	assert.NotContains(t, names, "brain_edit_root")
 }
 
 func TestBrainIndexStaysCallableForAdminUseAfterDeSurfacing(t *testing.T) {

ingestion/internal/mcp/tools_capture.go

@@ -31,7 +31,7 @@ func captureToolDescriptor() 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)"),
+			"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"},
@@ -41,7 +41,7 @@ func captureToolDescriptor() map[string]any {
 		"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"),
+			"title": str("issue title (create)"), "body": str("issue/comment body"),
 		},
 		"required": []string{"repo", "action"},
 	}
@@ -51,14 +51,14 @@ func captureToolDescriptor() map[string]any {
 			"context": map[string]any{
 				"type": "object",
 				"properties": map[string]any{
-					"harness":     str("descriptive harness label (telemetry only, never a gate input)"),
+					"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},
-			"dry_run":  map[string]any{"type": "boolean", "description": "validate + return the would-be receipt, write nothing"},
+			"dry_run": map[string]any{"type": "boolean", "description": "validate + return the would-be receipt, write nothing"},
 		},
 	}
 	b, _ := json.Marshal(schema)

ingestion/internal/mcp/tools_notes.go

@@ -1,222 +0,0 @@
-package mcp
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"log/slog"
-	"strings"
-	"time"
-
-	"github.com/mathiasbq/hyperguild/ingestion/internal/brain"
-	"github.com/mathiasbq/hyperguild/ingestion/internal/capture"
-	"github.com/mathiasbq/hyperguild/ingestion/internal/classification"
-	"github.com/mathiasbq/hyperguild/ingestion/internal/notes"
-)
-
-// noteToolDescriptors are the model-facing halves of brain#4.
-//
-// brain_edit_root is deliberately absent: it dispatches but is not listed, the
-// same de-surfacing ADR-0012 rule 4 applies to brain_index (#78). Hiding the
-// verb matters here for a specific reason — brain content is ingested from the
-// outside world and reaches a model's context, so a listed governance-file
-// editor is a durable prompt-injection path: one poisoned page could rewrite
-// the CLAUDE.md that a .dispatch-allow agent later obeys. A human who knows
-// the tool exists can still call it; a model reading tools/list cannot
-// discover it.
-func noteToolDescriptors() []map[string]any {
-	str := func(d string) map[string]any { return map[string]any{"type": "string", "description": d} }
-	schema := func(required []string, props map[string]any) json.RawMessage {
-		b, _ := json.Marshal(map[string]any{"type": "object", "required": required, "properties": props})
-		return b
-	}
-	return []map[string]any{
-		{
-			"name": "brain_read",
-			"description": "Return a note's raw markdown verbatim — no synthesis, no excerpting. " +
-				"Use this to obtain the exact text before brain_edit; never build old_str from a " +
-				"brain_query excerpt, which is truncated and normalised and will not match.",
-			"inputSchema": schema([]string{"path"}, map[string]any{
-				"path": str("brain-relative path under knowledge/ or wiki/, e.g. wiki/homelab/facts/x.md"),
-			}),
-		},
-		{
-			"name": "brain_edit",
-			"description": "Replace exactly one occurrence of old_str with new_str in a note, leaving " +
-				"every other byte identical. Fails loudly if old_str is absent or matches more than " +
-				"once — extend old_str until it is unique. Does NOT stamp updated_at or supersedes " +
-				"(brain_update does); it is a byte-level patch, not a metadata operation.",
-			"inputSchema": schema([]string{"path", "old_str", "new_str"}, map[string]any{
-				"path":    str("brain-relative path under knowledge/ or wiki/"),
-				"old_str": str("exact text to replace; must occur exactly once"),
-				"new_str": str("replacement text; empty string deletes old_str"),
-			}),
-		},
-	}
-}
-
-// --- hyperguild#97: governance-rewrite observability -----------------------
-
-// govNotifier raises an out-of-band alert. Declared here rather than importing
-// internal/audit so the MCP package keeps depending on capture alone.
-type govNotifier interface {
-	Notify(ctx context.Context, msg string) error
-}
-
-// WithGovernanceObserver attaches the audit sink and notifier that observe a
-// successful brain_edit_root. Both are optional; either may be nil.
-func (s *Server) WithGovernanceObserver(sink capture.AuditSink, n govNotifier) {
-	s.govAudit, s.govNotify = sink, n
-}
-
-type brainReadArgs struct {
-	Path string `json:"path"`
-}
-
-func (s *Server) brainRead(_ context.Context, args json.RawMessage) (json.RawMessage, error) {
-	var a brainReadArgs
-	if err := json.Unmarshal(args, &a); err != nil {
-		return nil, fmt.Errorf("parse args: %w", err)
-	}
-	content, err := notes.Read(s.brainDir, a.Path)
-	if err != nil {
-		return nil, err
-	}
-	return json.Marshal(map[string]any{"path": a.Path, "content": string(content)})
-}
-
-type brainEditArgs struct {
-	Path   string `json:"path"`
-	OldStr string `json:"old_str"`
-	NewStr string `json:"new_str"`
-}
-
-// brainEdit is the model-facing editor: notes only.
-//
-// Deliberately NOT audited (#97). A note edit is already fully reconstructible
-// from git history, which carries the same before/after bytes plus a diff.
-// Governance files get the extra trail because they change what later agents
-// obey — the asymmetry is about instruction-carrying content, not about how
-// hard the change is to reconstruct. Auditing every note edit would also bury
-// the rare governance record under routine traffic, which is how an alert
-// stops being read.
-func (s *Server) brainEdit(_ context.Context, args json.RawMessage) (json.RawMessage, error) {
-	_, out, err := s.editWithScope(args, notes.ScopeNotes)
-	return out, err
-}
-
-// brainEditRoot edits a governance file (CLAUDE.md). De-surfaced AND gated on
-// the authenticated principal: only the static local-CLI token may call it, so
-// a claude.ai-origin session — the one that may have just read an untrusted
-// page — cannot rewrite the instructions later agents load.
-func (s *Server) brainEditRoot(ctx context.Context, args json.RawMessage) (json.RawMessage, error) {
-	info, ok := ctx.Value(principalKey).(principalInfo)
-	if !ok || !info.viaStatic {
-		return nil, fmt.Errorf("brain_edit_root requires the local static principal; " +
-			"a governance file is not editable from a model-facing origin")
-	}
-	res, out, err := s.editWithScope(args, notes.ScopeRoot)
-	if err != nil {
-		// A refusal is not a rewrite. Recording or alerting on one would cry
-		// wolf, and the gate already logs its own denials.
-		return out, err
-	}
-	// A durable instruction rewrite should be loud, not silent.
-	slog.Warn("brain_edit_root applied", "principal", info.principal, "result", string(out))
-	s.observeGovernanceEdit(ctx, info.principal, res)
-	return out, err
-}
-
-// observeGovernanceEdit records and alerts on a rewrite that already landed.
-//
-// Best-effort by construction: the bytes are written and brain-sync will commit
-// them within the quarter hour, so failing the call here would report a
-// non-rewrite to the caller while the rewrite sits on disk. A failure to
-// observe is therefore logged at ERROR — the one case where the trail itself is
-// what broke, and the only remaining signal.
-func (s *Server) observeGovernanceEdit(ctx context.Context, principal string, res notes.Result) {
-	// Path and hashes only. The notification leaves the cluster for a phone
-	// via a third-party topic; a hash identifies the rewrite, the bytes would
-	// leak whatever was written into an instruction file.
-	msg := fmt.Sprintf("brain_edit_root applied\npath=%s\nprincipal=%s\nbefore=%s\nafter=%s",
-		res.Path, principal, res.PrevContentHash, res.ContentHash)
-
-	if s.govNotify != nil {
-		if err := s.govNotify.Notify(ctx, msg); err != nil {
-			slog.Error("brain_edit_root notify failed", "path", res.Path, "err", err)
-		}
-	}
-	if s.govAudit == nil {
-		return
-	}
-	// Internal, not Confidential: a governance file is not client data, and
-	// Confidential would make DegradingSink REFUSE to record while loki is
-	// down rather than buffer — losing exactly the record that matters most.
-	outcome, err := s.govAudit.Reserve(ctx, classification.Internal)
-	if err != nil {
-		slog.Error("brain_edit_root audit reserve failed", "path", res.Path, "err", err)
-		return
-	}
-	entry := capture.AuditEntry{
-		Timestamp:               time.Now().UTC(),
-		Principal:               principal,
-		Actor:                   "brain_edit_root",
-		Harness:                 "mcp",
-		EffectiveClassification: classification.Internal.String(),
-		Items:                   []string{res.Path},
-		SecurityEvents: []string{fmt.Sprintf(
-			"governance file rewritten: %s before=%s after=%s",
-			res.Path, res.PrevContentHash, res.ContentHash)},
-	}
-	if err := s.govAudit.Record(ctx, entry, outcome); err != nil {
-		slog.Error("brain_edit_root audit record failed", "path", res.Path, "err", err)
-	}
-}
-
-func (s *Server) editWithScope(args json.RawMessage, scope notes.Scope) (notes.Result, json.RawMessage, error) {
-	var a brainEditArgs
-	if err := json.Unmarshal(args, &a); err != nil {
-		return notes.Result{}, nil, fmt.Errorf("parse args: %w", err)
-	}
-	res, err := notes.Edit(s.brainDir, a.Path, a.OldStr, a.NewStr, scope)
-	if err != nil {
-		return notes.Result{}, nil, err
-	}
-
-	// Reindex only when the edit could have changed what the index reads.
-	// BuildWingIndex consumes title/created_at from the frontmatter block;
-	// BM25 walks the filesystem live and embeddings are mtime-driven, so an
-	// unconditional rebuild would buy nothing and dirty a second file —
-	// _index.md being precisely the class brain-sync already needs a bespoke
-	// conflict resolver for.
-	if wing := wingOf(res.Path); wing != "" && touchesFrontmatter(a.OldStr, a.NewStr) {
-		if ierr := brain.BuildWingIndex(s.brainDir, wing); ierr != nil {
-			// Best-effort, matching every other index hook here: the write
-			// already landed and will be committed, so failing the call would
-			// make the caller retry an edit whose old_str no longer exists.
-			res.ReindexError = ierr.Error()
-		}
-	}
-	out, merr := json.Marshal(res)
-	return res, out, merr
-}
-
-// wingOf returns the wing for a wiki path, or "" for knowledge/ and root.
-func wingOf(rel string) string {
-	parts := strings.Split(rel, "/")
-	if len(parts) < 3 || parts[0] != "wiki" {
-		return ""
-	}
-	return parts[1]
-}
-
-// touchesFrontmatter reports whether either side of the edit mentions a field
-// the wing index reads.
-func touchesFrontmatter(oldStr, newStr string) bool {
-	for _, s := range []string{oldStr, newStr} {
-		if strings.Contains(s, "title:") || strings.Contains(s, "created_at:") || strings.Contains(s, "---") {
-			return true
-		}
-	}
-	return false
-}

ingestion/internal/mcp/tools_notes_test.go

@@ -1,297 +0,0 @@
-// ingestion/internal/mcp/tools_notes_test.go
-package mcp_test
-
-import (
-	"context"
-	"crypto/sha256"
-	"encoding/hex"
-	"encoding/json"
-	"net/http"
-	"net/http/httptest"
-	"os"
-	"path/filepath"
-	"strings"
-	"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"
-)
-
-// ---- brain#4: brain_read / brain_edit through the JSON-RPC surface --------
-
-func newBrainRepo(t *testing.T) string {
-	t.Helper()
-	dir := t.TempDir()
-	require.NoError(t, os.MkdirAll(filepath.Join(dir, ".git"), 0o755))
-	require.NoError(t, os.MkdirAll(filepath.Join(dir, "wiki/homelab/facts"), 0o755))
-	require.NoError(t, os.WriteFile(filepath.Join(dir, "wiki/homelab/facts/n.md"),
-		[]byte("---\ntitle: 'n'\n---\n\nalpha\nbeta\n"), 0o644))
-	require.NoError(t, os.WriteFile(filepath.Join(dir, "CLAUDE.md"), []byte("# rules\n"), 0o644))
-	return dir
-}
-
-func call(t *testing.T, srv *mcp.Server, name string, args map[string]any) map[string]any {
-	t.Helper()
-	req := httptest.NewRequest(http.MethodPost, "/mcp", body(t, map[string]any{
-		"jsonrpc": "2.0", "id": 1, "method": "tools/call",
-		"params": map[string]any{"name": name, "arguments": args},
-	}))
-	rr := httptest.NewRecorder()
-	srv.ServeHTTP(rr, req)
-	var resp map[string]any
-	require.NoError(t, json.Unmarshal(rr.Body.Bytes(), &resp))
-	return resp
-}
-
-func TestBrainReadAndEdit_RoundTripThroughJSONRPC(t *testing.T) {
-	// The Go functions are tested in internal/notes; this pins the transport,
-	// because a tool that works in-process and is unreachable over JSON-RPC
-	// is indistinguishable from a working one in a unit test.
-	dir := newBrainRepo(t)
-	srv := mcp.NewServer(dir, nil, nil, nil)
-
-	resp := call(t, srv, "brain_read", map[string]any{"path": "wiki/homelab/facts/n.md"})
-	require.NotContains(t, resp, "error", "%v", resp["error"])
-
-	resp = call(t, srv, "brain_edit", map[string]any{
-		"path": "wiki/homelab/facts/n.md", "old_str": "beta", "new_str": "BETA",
-	})
-	require.NotContains(t, resp, "error", "%v", resp["error"])
-
-	got, err := os.ReadFile(filepath.Join(dir, "wiki/homelab/facts/n.md"))
-	require.NoError(t, err)
-	assert.Equal(t, "---\ntitle: 'n'\n---\n\nalpha\nBETA\n", string(got),
-		"only the matched bytes may change")
-}
-
-func TestBrainEdit_RefusesGovernanceFilesFromTheModelFacingTool(t *testing.T) {
-	dir := newBrainRepo(t)
-	srv := mcp.NewServer(dir, nil, nil, nil)
-
-	resp := call(t, srv, "brain_edit", map[string]any{
-		"path": "CLAUDE.md", "old_str": "# rules", "new_str": "# rewritten",
-	})
-	require.Contains(t, resp, "error", "brain_edit must not reach CLAUDE.md")
-
-	got, err := os.ReadFile(filepath.Join(dir, "CLAUDE.md"))
-	require.NoError(t, err)
-	assert.Equal(t, "# rules\n", string(got))
-}
-
-func TestBrainEditRoot_RefusedWithoutTheLocalStaticPrincipal(t *testing.T) {
-	// No principal in context is the model-facing case (and the default in
-	// this test server): the privileged door must stay shut.
-	dir := newBrainRepo(t)
-	srv := mcp.NewServer(dir, nil, nil, nil)
-
-	resp := call(t, srv, "brain_edit_root", map[string]any{
-		"path": "CLAUDE.md", "old_str": "# rules", "new_str": "# rewritten",
-	})
-	require.Contains(t, resp, "error")
-
-	got, err := os.ReadFile(filepath.Join(dir, "CLAUDE.md"))
-	require.NoError(t, err)
-	assert.Equal(t, "# rules\n", string(got), "governance file must be untouched")
-}
-
-func TestBrainGet_CannotReachSessionTranscripts(t *testing.T) {
-	// Pre-existing hole, not introduced here: api.ReadNote resolves any
-	// brain-relative path and parseFrontmatter returns the WHOLE file as body
-	// when there is no frontmatter fence. archive/ holds verbatim Claude
-	// session transcripts (up to 500 KB) that BM25 never indexes, so they are
-	// invisible to search and trivially readable by path — and CLAUDE.md
-	// documents the layout.
-	dir := newBrainRepo(t)
-	require.NoError(t, os.MkdirAll(filepath.Join(dir, "archive/claude-sessions/koala"), 0o755))
-	require.NoError(t, os.WriteFile(
-		filepath.Join(dir, "archive/claude-sessions/koala/session-1.md"),
-		[]byte("verbatim transcript with tool output\n"), 0o644))
-
-	srv := mcp.NewServer(dir, nil, nil, nil)
-	resp := call(t, srv, "brain_get", map[string]any{"path": "archive/claude-sessions/koala/session-1.md"})
-
-	require.Contains(t, resp, "error", "brain_get must not read outside knowledge/ and wiki/")
-	assert.NotContains(t, string(mustJSON(t, resp)), "verbatim transcript")
-}
-
-func TestBrainGet_StillReadsNotes(t *testing.T) {
-	dir := newBrainRepo(t)
-	srv := mcp.NewServer(dir, nil, nil, nil)
-
-	resp := call(t, srv, "brain_get", map[string]any{"path": "wiki/homelab/facts/n.md"})
-	assert.NotContains(t, resp, "error", "%v", resp["error"])
-}
-
-func mustJSON(t *testing.T, v any) []byte {
-	t.Helper()
-	b, err := json.Marshal(v)
-	require.NoError(t, err)
-	return b
-}
-
-// ---- hyperguild#97: a governance rewrite must be observed, not just gated ----
-
-// govSink captures audit records. Governance edits are rare, so the whole
-// history is kept and asserted on rather than sampled.
-type govSink struct {
-	entries  []capture.AuditEntry
-	outcomes []capture.AuditOutcome
-	recErr   error
-}
-
-func (s *govSink) Reserve(context.Context, classification.Level) (capture.AuditOutcome, error) {
-	return capture.AuditCentral, nil
-}
-
-func (s *govSink) Record(_ context.Context, e capture.AuditEntry, o capture.AuditOutcome) error {
-	s.entries = append(s.entries, e)
-	s.outcomes = append(s.outcomes, o)
-	return s.recErr
-}
-
-type govNotifier struct {
-	msgs []string
-	err  error
-}
-
-func (n *govNotifier) Notify(_ context.Context, msg string) error {
-	n.msgs = append(n.msgs, msg)
-	return n.err
-}
-
-// govServer wires capture (which is what re-derives the static principal) plus
-// the #97 observer, and returns the brain dir so the test can read the file.
-func govServer(t *testing.T) (*mcp.Server, string, *govSink, *govNotifier) {
-	t.Helper()
-	dir := newBrainRepo(t)
-	cfg, err := classification.Load(dir)
-	require.NoError(t, err)
-	svc := capture.NewService(brainstore.New(dir), capFakeTracker{}, cfg, audit.NewSlogSink(nil))
-
-	srv := mcp.NewServer(dir, nil, nil, nil)
-	srv.WithCapture(svc, nil, capStaticTok, "local-cli", capturehttp.NewOriginResolver(nil))
-	sink, notifier := &govSink{}, &govNotifier{}
-	srv.WithGovernanceObserver(sink, notifier)
-	return srv, dir, sink, notifier
-}
-
-// authCall is call() with an Authorization header, so the static principal is
-// present and brain_edit_root's gate opens.
-func authCall(t *testing.T, srv *mcp.Server, authz, name string, args map[string]any) map[string]any {
-	t.Helper()
-	req := httptest.NewRequest(http.MethodPost, "/mcp", body(t, map[string]any{
-		"jsonrpc": "2.0", "id": 1, "method": "tools/call",
-		"params": map[string]any{"name": name, "arguments": args},
-	}))
-	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 sha256hex(s string) string {
-	sum := sha256.Sum256([]byte(s))
-	return hex.EncodeToString(sum[:])
-}
-
-func TestBrainEditRoot_RecordsAnAuditEntryNamingPrincipalPathAndBothHashes(t *testing.T) {
-	// The gate proves a rewrite was ALLOWED. Only a record proves one HAPPENED
-	// — and brain-sync will commit it within 15 minutes authored `brain-sync`,
-	// so git history cannot tell it apart from routine note traffic.
-	srv, dir, sink, _ := govServer(t)
-
-	resp := authCall(t, srv, "Bearer "+capStaticTok, "brain_edit_root", map[string]any{
-		"path": "CLAUDE.md", "old_str": "# rules", "new_str": "# rewritten",
-	})
-	require.NotContains(t, resp, "error", "%v", resp["error"])
-
-	require.Len(t, sink.entries, 1, "exactly one audit record per governance rewrite")
-	e := sink.entries[0]
-	assert.Equal(t, "local-cli", e.Principal)
-	assert.Contains(t, e.Items, "CLAUDE.md", "the record must name what was rewritten")
-
-	joined := strings.Join(e.SecurityEvents, " ")
-	assert.Contains(t, joined, sha256hex("# rules\n"), "before-hash must be recorded")
-	assert.Contains(t, joined, sha256hex("# rewritten\n"), "after-hash must be recorded")
-	assert.NotZero(t, e.Timestamp)
-
-	got, err := os.ReadFile(filepath.Join(dir, "CLAUDE.md"))
-	require.NoError(t, err)
-	assert.Equal(t, "# rewritten\n", string(got))
-}
-
-func TestBrainEditRoot_NotifiesWithPathAndHashesButNeverContent(t *testing.T) {
-	srv, _, _, notifier := govServer(t)
-
-	resp := authCall(t, srv, "Bearer "+capStaticTok, "brain_edit_root", map[string]any{
-		"path": "CLAUDE.md", "old_str": "# rules", "new_str": "# rewritten",
-	})
-	require.NotContains(t, resp, "error", "%v", resp["error"])
-
-	require.Len(t, notifier.msgs, 1)
-	msg := notifier.msgs[0]
-	assert.Contains(t, msg, "CLAUDE.md")
-	assert.Contains(t, msg, "local-cli")
-	assert.Contains(t, msg, sha256hex("# rules\n"))
-	assert.Contains(t, msg, sha256hex("# rewritten\n"))
-
-	// The notification travels to a phone through a third-party topic. A hash
-	// identifies a rewrite; the bytes would leak whatever was written.
-	assert.NotContains(t, msg, "# rewritten", "no file content in the notification body")
-	assert.NotContains(t, msg, "# rules")
-}
-
-func TestBrainEditRoot_RefusedProducesNoRecordNoNotificationNoWrite(t *testing.T) {
-	srv, dir, sink, notifier := govServer(t)
-
-	// No Authorization header → no static principal → the gate stays shut.
-	resp := authCall(t, srv, "", "brain_edit_root", map[string]any{
-		"path": "CLAUDE.md", "old_str": "# rules", "new_str": "# rewritten",
-	})
-	require.Contains(t, resp, "error")
-
-	assert.Empty(t, sink.entries, "a refusal is not a rewrite — recording one would cry wolf")
-	assert.Empty(t, notifier.msgs)
-	got, err := os.ReadFile(filepath.Join(dir, "CLAUDE.md"))
-	require.NoError(t, err)
-	assert.Equal(t, "# rules\n", string(got))
-}
-
-func TestBrainEditRoot_FailedEditProducesNoRecordNoNotification(t *testing.T) {
-	// Authorised but no match: the door opened and nothing went through it.
-	srv, _, sink, notifier := govServer(t)
-
-	resp := authCall(t, srv, "Bearer "+capStaticTok, "brain_edit_root", map[string]any{
-		"path": "CLAUDE.md", "old_str": "absent-from-the-file", "new_str": "x",
-	})
-	require.Contains(t, resp, "error")
-
-	assert.Empty(t, sink.entries)
-	assert.Empty(t, notifier.msgs)
-}
-
-func TestBrainEdit_OnOrdinaryNotesIsNotAudited(t *testing.T) {
-	// The decided asymmetry (#97): note edits are covered by git history, which
-	// carries the same before/after bytes with a diff. Governance files get the
-	// extra trail because they change what later agents obey, not because they
-	// are harder to reconstruct.
-	srv, _, sink, notifier := govServer(t)
-
-	resp := authCall(t, srv, "Bearer "+capStaticTok, "brain_edit", map[string]any{
-		"path": "wiki/homelab/facts/n.md", "old_str": "beta", "new_str": "BETA",
-	})
-	require.NotContains(t, resp, "error", "%v", resp["error"])
-
-	assert.Empty(t, sink.entries, "note edits must not fill the governance audit trail")
-	assert.Empty(t, notifier.msgs)
-}

ingestion/internal/notes/edit.go

@@ -1,282 +0,0 @@
-package notes
-
-import (
-	"crypto/sha256"
-	"encoding/hex"
-	"errors"
-	"fmt"
-	"os"
-	"path/filepath"
-	"strings"
-	"sync"
-	"syscall"
-	"unicode/utf8"
-)
-
-// maxNoteBytes caps what Read will hand back. Generous for knowledge/ and
-// wiki/ (the largest note today is far under it) and small enough that a
-// pathological file cannot flood a caller's context.
-const maxNoteBytes = 256 << 10
-
-// Errors callers distinguish.
-var (
-	ErrNoMatch    = errors.New("notes: old_str not found")
-	ErrAmbiguous  = errors.New("notes: old_str matches more than once")
-	ErrNotUTF8    = errors.New("notes: content is not valid UTF-8")
-	ErrGitBusy    = errors.New("notes: a git operation is in progress")
-	ErrTooLarge   = errors.New("notes: file exceeds the readable size limit")
-	ErrDegenerate = errors.New("notes: edit is degenerate")
-	ErrInConflict = errors.New("notes: file contains unresolved conflict markers")
-)
-
-// pathLocks serialises edits per file within this process. The flock below
-// covers the cross-process case (two pods share the hostPath during a rolling
-// update, and brain-fix/brain-enrich write the same tree).
-var pathLocks sync.Map // string -> *sync.Mutex
-
-// Result is what a successful edit reports.
-type Result struct {
-	Path string `json:"path"`
-	// PrevContentHash is the sha256 of the file as it was before this edit.
-	// Paired with ContentHash it identifies a rewrite in an audit trail or an
-	// alert without carrying any of the bytes (hyperguild#97).
-	PrevContentHash string `json:"prev_content_hash"`
-	ContentHash     string `json:"content_hash"`
-	BytesBefore     int    `json:"bytes_before"`
-	BytesAfter      int    `json:"bytes_after"`
-	ReindexError    string `json:"reindex_error,omitempty"`
-}
-
-// Read returns a note's bytes verbatim.
-//
-// No frontmatter parsing, no excerpting, no normalisation: the entire purpose
-// is to give a caller an exact basis for an edit. An excerpt from brain_query
-// would be truncated and normalised, and every old_str built from one would
-// miss.
-func Read(brainDir, path string) ([]byte, error) {
-	t, err := Resolve(brainDir, path, ScopeNotes)
-	if err != nil {
-		return nil, err
-	}
-	return readContained(t)
-}
-
-// ReadScoped is Read for a caller already holding the privileged scope.
-func ReadScoped(brainDir, path string, scope Scope) ([]byte, error) {
-	t, err := Resolve(brainDir, path, scope)
-	if err != nil {
-		return nil, err
-	}
-	return readContained(t)
-}
-
-func readContained(t Target) ([]byte, error) {
-	fi, err := os.Stat(t.Abs)
-	if err != nil {
-		return nil, fmt.Errorf("notes: stat %s: %w", t.Rel, err)
-	}
-	if fi.Size() > maxNoteBytes {
-		return nil, fmt.Errorf("%w: %s is %d bytes (limit %d)", ErrTooLarge, t.Rel, fi.Size(), maxNoteBytes)
-	}
-	b, err := os.ReadFile(t.Abs)
-	if err != nil {
-		return nil, fmt.Errorf("notes: read %s: %w", t.Rel, err)
-	}
-	// The MCP response marshals this into a JSON string, and encoding/json
-	// substitutes U+FFFD for invalid UTF-8 — silently returning different
-	// bytes than the file holds, which defeats "verbatim" entirely.
-	if !utf8.Valid(b) {
-		return nil, fmt.Errorf("%w: %s", ErrNotUTF8, t.Rel)
-	}
-	return b, nil
-}
-
-// Edit replaces exactly one occurrence of oldStr with newStr, in place.
-//
-// Fails loudly and writes nothing on: zero matches, more than one match
-// (counted with overlap), degenerate arguments, invalid UTF-8, a git operation
-// in flight, or unresolved conflict markers in the target.
-func Edit(brainDir, path, oldStr, newStr string, scope Scope) (Result, error) {
-	t, err := Resolve(brainDir, path, scope)
-	if err != nil {
-		return Result{}, err
-	}
-	if oldStr == "" {
-		return Result{}, fmt.Errorf("%w: old_str is empty", ErrDegenerate)
-	}
-	if oldStr == newStr {
-		return Result{}, fmt.Errorf("%w: old_str equals new_str", ErrDegenerate)
-	}
-	if !utf8.ValidString(newStr) {
-		return Result{}, fmt.Errorf("%w: new_str", ErrNotUTF8)
-	}
-	// brain#2 guard: refuse to write to a tree the sync does not commit from.
-	if err := assertSyncSource(brainDir); err != nil {
-		return Result{}, err
-	}
-	if err := assertGitIdle(brainDir); err != nil {
-		return Result{}, err
-	}
-
-	mu := lockFor(t.Abs)
-	mu.Lock()
-	defer mu.Unlock()
-
-	unlock, err := flockFile(t.Abs)
-	if err != nil {
-		return Result{}, err
-	}
-	defer unlock()
-
-	// Read INSIDE the lock: the match count must be evaluated against the
-	// bytes we are about to overwrite, or a concurrent edit is silently lost
-	// while both callers are told they succeeded.
-	before, err := readContained(t)
-	if err != nil {
-		return Result{}, err
-	}
-	if hasConflictMarkers(before) {
-		return Result{}, fmt.Errorf("%w: %s", ErrInConflict, t.Rel)
-	}
-
-	switch n := countOverlapping(string(before), oldStr); {
-	case n == 0:
-		return Result{}, fmt.Errorf("%w in %s (0 matches)%s", ErrNoMatch, t.Rel, crlfHint(string(before), oldStr))
-	case n > 1:
-		return Result{}, fmt.Errorf("%w in %s (%d matches) — extend old_str until it is unique",
-			ErrAmbiguous, t.Rel, n)
-	}
-
-	after := strings.Replace(string(before), oldStr, newStr, 1)
-	if err := writeAtomic(t.Abs, []byte(after)); err != nil {
-		return Result{}, err
-	}
-
-	sum := sha256.Sum256([]byte(after))
-	prev := sha256.Sum256(before)
-	return Result{
-		Path:            t.Rel,
-		PrevContentHash: hex.EncodeToString(prev[:]),
-		ContentHash:     hex.EncodeToString(sum[:]),
-		BytesBefore:     len(before),
-		BytesAfter:      len(after),
-	}, nil
-}
-
-// countOverlapping counts occurrences allowing overlap. bytes.Count does not:
-// "aa" occurs once in "aaa" by its reckoning, so a Count-based uniqueness
-// check accepts an ambiguous edit as unique.
-func countOverlapping(s, sub string) int {
-	var n, from int
-	for {
-		i := strings.Index(s[from:], sub)
-		if i < 0 {
-			return n
-		}
-		n++
-		from += i + 1
-	}
-}
-
-// crlfHint reports whether the caller's old_str would have matched if line
-// endings agreed. It never normalises — that would break byte-identity — but
-// an opaque "no match" is unfixable from the caller's side, and a stripped \r
-// is the likeliest cause.
-func crlfHint(content, oldStr string) string {
-	if strings.Contains(content, "\r\n") && !strings.Contains(oldStr, "\r\n") {
-		if strings.Contains(strings.ReplaceAll(content, "\r\n", "\n"), oldStr) {
-			return " — the file uses CRLF line endings and old_str does not; include the \\r"
-		}
-	}
-	return ""
-}
-
-func hasConflictMarkers(b []byte) bool {
-	s := string(b)
-	return strings.Contains(s, "\n<<<<<<< ") || strings.HasPrefix(s, "<<<<<<< ")
-}
-
-// assertGitIdle refuses while brain-sync (or brain-fix, or a human) has a git
-// operation in flight. An edit landing between `git merge` and its abort is
-// either hard-reset away or committed as a wrongly resolved conflict — and the
-// caller was told it succeeded.
-func assertGitIdle(brainDir string) error {
-	for _, marker := range []string{"MERGE_HEAD", "REBASE_HEAD", "CHERRY_PICK_HEAD", "index.lock"} {
-		if _, err := os.Stat(filepath.Join(brainDir, ".git", marker)); err == nil {
-			return fmt.Errorf("%w (.git/%s present) — retry after the sync settles", ErrGitBusy, marker)
-		}
-	}
-	return nil
-}
-
-func lockFor(abs string) *sync.Mutex {
-	v, _ := pathLocks.LoadOrStore(abs, &sync.Mutex{})
-	return v.(*sync.Mutex)
-}
-
-// flockFile takes an advisory lock covering other processes sharing the
-// hostPath — during a RollingUpdate two ingestion pods do.
-func flockFile(abs string) (func(), error) {
-	f, err := os.OpenFile(abs+".lock", os.O_CREATE|os.O_RDWR, 0o644)
-	if err != nil {
-		return nil, fmt.Errorf("notes: lock %s: %w", filepath.Base(abs), err)
-	}
-	if err := syscall.Flock(int(f.Fd()), syscall.LOCK_EX); err != nil {
-		_ = f.Close()
-		return nil, fmt.Errorf("notes: flock %s: %w", filepath.Base(abs), err)
-	}
-	return func() {
-		_ = syscall.Flock(int(f.Fd()), syscall.LOCK_UN)
-		_ = f.Close()
-		_ = os.Remove(abs + ".lock")
-	}, nil
-}
-
-// writeAtomic replaces the file via a same-directory temp + rename, then
-// fsyncs the directory so the rename survives a node crash.
-//
-// Same directory because a rename across the hostPath boundary fails with
-// EXDEV; the ".tmp" suffix because the tree's .gitignore already covers it, so
-// a leaked temp is not committed by `git add -A`.
-func writeAtomic(abs string, content []byte) error {
-	dir := filepath.Dir(abs)
-	tmp, err := os.CreateTemp(dir, filepath.Base(abs)+".*.tmp")
-	if err != nil {
-		return fmt.Errorf("notes: temp file: %w", err)
-	}
-	tmpName := tmp.Name()
-	defer func() { _ = os.Remove(tmpName) }() // no-op once renamed
-
-	if _, err := tmp.Write(content); err != nil {
-		_ = tmp.Close()
-		return fmt.Errorf("notes: write temp: %w", err)
-	}
-	if err := tmp.Sync(); err != nil {
-		_ = tmp.Close()
-		return fmt.Errorf("notes: sync temp: %w", err)
-	}
-	if err := tmp.Close(); err != nil {
-		return fmt.Errorf("notes: close temp: %w", err)
-	}
-	// CreateTemp makes 0600; every other writer of this tree uses 0644 and
-	// other uids read it.
-	if err := os.Chmod(tmpName, 0o644); err != nil {
-		return fmt.Errorf("notes: chmod temp: %w", err)
-	}
-	if err := os.Rename(tmpName, abs); err != nil {
-		return fmt.Errorf("notes: rename: %w", err)
-	}
-	return fsyncDir(dir)
-}
-
-func fsyncDir(dir string) error {
-	d, err := os.Open(dir)
-	if err != nil {
-		return fmt.Errorf("notes: open dir: %w", err)
-	}
-	defer func() { _ = d.Close() }()
-	if err := d.Sync(); err != nil {
-		return fmt.Errorf("notes: fsync dir: %w", err)
-	}
-	return nil
-}

ingestion/internal/notes/edit_test.go

@@ -1,256 +0,0 @@
-package notes
-
-import (
-	"os"
-	"path/filepath"
-	"strings"
-	"sync"
-	"testing"
-)
-
-func seed(t *testing.T, dir, rel, content string) string {
-	t.Helper()
-	abs := filepath.Join(dir, rel)
-	if err := os.MkdirAll(filepath.Dir(abs), 0o755); err != nil {
-		t.Fatal(err)
-	}
-	if err := os.WriteFile(abs, []byte(content), 0o644); err != nil {
-		t.Fatal(err)
-	}
-	return abs
-}
-
-func read(t *testing.T, abs string) string {
-	t.Helper()
-	b, err := os.ReadFile(abs)
-	if err != nil {
-		t.Fatal(err)
-	}
-	return string(b)
-}
-
-func TestRead_ReturnsVerbatimBytes(t *testing.T) {
-	dir := newBrain(t)
-	const body = "---\ntitle: 'x'\n---\n\nbody with  double  spaces\r\nand a CRLF line\nno trailing newline"
-	seed(t, dir, "knowledge/verbatim.md", body)
-
-	got, err := Read(dir, "knowledge/verbatim.md")
-	if err != nil {
-		t.Fatalf("Read: %v", err)
-	}
-	if string(got) != body {
-		t.Errorf("Read returned %q, want the file byte-for-byte", got)
-	}
-}
-
-func TestRead_RefusesNonUTF8RatherThanCorruptingIt(t *testing.T) {
-	// The response is marshalled into a JSON string, and encoding/json
-	// replaces invalid UTF-8 with U+FFFD. Returning it would mean every
-	// old_str the caller derives from that region can never match, and
-	// pasting it back would write the corruption to disk permanently.
-	dir := newBrain(t)
-	seed(t, dir, "knowledge/bad.md", "ok \xff\xfe broken\n")
-
-	if _, err := Read(dir, "knowledge/bad.md"); err == nil {
-		t.Fatal("Read accepted invalid UTF-8; it must refuse rather than silently substitute")
-	}
-}
-
-func TestEdit_ReplacesExactlyOnceAndLeavesEveryOtherByteAlone(t *testing.T) {
-	dir := newBrain(t)
-	const body = "---\ntitle: 'x'\n---\n\nalpha\nbeta\ngamma\n"
-	abs := seed(t, dir, "knowledge/n.md", body)
-
-	res, err := Edit(dir, "knowledge/n.md", "beta", "BETA", ScopeNotes)
-	if err != nil {
-		t.Fatalf("Edit: %v", err)
-	}
-	want := strings.Replace(body, "beta", "BETA", 1)
-	if got := read(t, abs); got != want {
-		t.Errorf("file = %q, want %q", got, want)
-	}
-	if res.ContentHash == "" {
-		t.Error("result should carry a content hash for read-after-write confirmation")
-	}
-}
-
-func TestEdit_RefusesAmbiguousAndAbsentMatchesWithoutWriting(t *testing.T) {
-	dir := newBrain(t)
-	const body = "alpha\nalpha\n"
-	abs := seed(t, dir, "knowledge/n.md", body)
-
-	cases := []struct{ name, old, want string }{
-		{"two matches", "alpha", "2"},
-		{"no match", "delta", "0"},
-	}
-	for _, tc := range cases {
-		t.Run(tc.name, func(t *testing.T) {
-			_, err := Edit(dir, "knowledge/n.md", tc.old, "x", ScopeNotes)
-			if err == nil {
-				t.Fatal("want a loud refusal")
-			}
-			if !strings.Contains(err.Error(), tc.want) {
-				t.Errorf("error must state the match count, got %v", err)
-			}
-			if got := read(t, abs); got != body {
-				t.Errorf("file changed on a refused edit: %q", got)
-			}
-		})
-	}
-}
-
-func TestEdit_CountsOverlappingMatches(t *testing.T) {
-	// bytes.Count counts NON-overlapping occurrences: "aa" in "aaa" is 1, so
-	// a Count-based uniqueness check calls an ambiguous edit unique.
-	dir := newBrain(t)
-	seed(t, dir, "knowledge/n.md", "aaa\n")
-
-	if _, err := Edit(dir, "knowledge/n.md", "aa", "b", ScopeNotes); err == nil {
-		t.Fatal("overlapping matches must be reported as ambiguous")
-	}
-}
-
-func TestEdit_RejectsDegenerateArguments(t *testing.T) {
-	dir := newBrain(t)
-	seed(t, dir, "knowledge/n.md", "alpha\n")
-
-	if _, err := Edit(dir, "knowledge/n.md", "", "x", ScopeNotes); err == nil {
-		t.Error("empty old_str must be rejected")
-	}
-	if _, err := Edit(dir, "knowledge/n.md", "alpha", "alpha", ScopeNotes); err == nil {
-		t.Error("a no-op edit must be rejected rather than burning a sync cycle")
-	}
-}
-
-func TestEdit_DeletionIsLegal(t *testing.T) {
-	dir := newBrain(t)
-	abs := seed(t, dir, "knowledge/n.md", "keep\ndrop\n")
-
-	if _, err := Edit(dir, "knowledge/n.md", "drop\n", "", ScopeNotes); err != nil {
-		t.Fatalf("Edit: %v", err)
-	}
-	if got := read(t, abs); got != "keep\n" {
-		t.Errorf("file = %q, want %q", got, "keep\n")
-	}
-}
-
-func TestEdit_ReportsWhenOnlyLineEndingsDiffer(t *testing.T) {
-	// The likeliest real failure: the caller's old_str lost its \r. Never
-	// normalise silently — that breaks byte-identity — but say so, because an
-	// opaque "no match" is unfixable from the caller's side.
-	dir := newBrain(t)
-	seed(t, dir, "knowledge/n.md", "alpha\r\nbeta\r\n")
-
-	_, err := Edit(dir, "knowledge/n.md", "alpha\nbeta", "x", ScopeNotes)
-	if err == nil {
-		t.Fatal("want a refusal")
-	}
-	if !strings.Contains(err.Error(), "line ending") {
-		t.Errorf("error should point at CRLF, got %v", err)
-	}
-}
-
-func TestEdit_RefusesWhileGitIsMidOperation(t *testing.T) {
-	// brain-sync runs `git merge -X ours origin/main`, and aborts on conflict
-	// with a hard reset. An edit landing inside that window is either erased
-	// or committed as a wrongly-resolved conflict, and the caller was told it
-	// succeeded.
-	dir := newBrain(t)
-	seed(t, dir, "knowledge/n.md", "alpha\n")
-
-	for _, marker := range []string{"MERGE_HEAD", "index.lock", "REBASE_HEAD"} {
-		t.Run(marker, func(t *testing.T) {
-			p := filepath.Join(dir, ".git", marker)
-			if err := os.WriteFile(p, []byte("x"), 0o644); err != nil {
-				t.Fatal(err)
-			}
-			defer func() { _ = os.Remove(p) }()
-
-			if _, err := Edit(dir, "knowledge/n.md", "alpha", "beta", ScopeNotes); err == nil {
-				t.Errorf("edit accepted while %s exists", marker)
-			}
-		})
-	}
-}
-
-func TestEdit_RefusesAFileHoldingConflictMarkers(t *testing.T) {
-	dir := newBrain(t)
-	seed(t, dir, "knowledge/n.md", "<<<<<<< HEAD\nours\n=======\ntheirs\n>>>>>>> origin/main\n")
-
-	if _, err := Edit(dir, "knowledge/n.md", "ours", "x", ScopeNotes); err == nil {
-		t.Fatal("editing one side of an unresolved conflict must be refused")
-	}
-}
-
-func TestEdit_ConcurrentEditsBothApply(t *testing.T) {
-	// Read-modify-write with no lock loses one update AND reports success for
-	// both. old_str uniqueness does not protect against it: uniqueness is
-	// evaluated against the stale read.
-	dir := newBrain(t)
-	abs := seed(t, dir, "knowledge/n.md", "alpha\nbeta\n")
-
-	var wg sync.WaitGroup
-	errs := make([]error, 2)
-	for i, pair := range [][2]string{{"alpha", "ALPHA"}, {"beta", "BETA"}} {
-		wg.Add(1)
-		go func(i int, old, new string) {
-			defer wg.Done()
-			_, errs[i] = Edit(dir, "knowledge/n.md", old, new, ScopeNotes)
-		}(i, pair[0], pair[1])
-	}
-	wg.Wait()
-
-	for i, err := range errs {
-		if err != nil {
-			t.Fatalf("edit %d failed: %v", i, err)
-		}
-	}
-	if got := read(t, abs); got != "ALPHA\nBETA\n" {
-		t.Errorf("file = %q, want both edits applied", got)
-	}
-}
-
-func TestEdit_LeavesNoTemporaryFileBehind(t *testing.T) {
-	dir := newBrain(t)
-	seed(t, dir, "knowledge/n.md", "alpha\n")
-
-	if _, err := Edit(dir, "knowledge/n.md", "alpha", "beta", ScopeNotes); err != nil {
-		t.Fatal(err)
-	}
-	entries, err := os.ReadDir(filepath.Join(dir, "knowledge"))
-	if err != nil {
-		t.Fatal(err)
-	}
-	for _, e := range entries {
-		if e.Name() != "note.md" && e.Name() != "n.md" {
-			t.Errorf("stray file left in the tree: %q (git add -A would commit it)", e.Name())
-		}
-	}
-}
-
-func TestEdit_PreservesReadableMode(t *testing.T) {
-	// Other uids write this tree (brain-fix, brain-enrich). os.CreateTemp
-	// yields 0600 and rename preserves it, which would break them silently.
-	dir := newBrain(t)
-	abs := seed(t, dir, "knowledge/n.md", "alpha\n")
-
-	if _, err := Edit(dir, "knowledge/n.md", "alpha", "beta", ScopeNotes); err != nil {
-		t.Fatal(err)
-	}
-	fi, err := os.Stat(abs)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if fi.Mode().Perm() != 0o644 {
-		t.Errorf("mode = %v, want 0644", fi.Mode().Perm())
-	}
-}
-
-func TestEdit_RefusesNonUTF8Replacement(t *testing.T) {
-	dir := newBrain(t)
-	seed(t, dir, "knowledge/n.md", "alpha\n")
-
-	if _, err := Edit(dir, "knowledge/n.md", "alpha", "bad \xff", ScopeNotes); err == nil {
-		t.Fatal("new_str with invalid UTF-8 must be refused, not written")
-	}
-}

ingestion/internal/notes/path.go

@@ -1,201 +0,0 @@
-// Package notes provides containment-checked read and surgical edit of brain
-// notes on the live tree that brain-sync commits from.
-//
-// Everything here is defensive for one reason: brain content is ingested from
-// the outside world, that content reaches a model's context via brain_query /
-// brain_context, and these primitives are callable by that model. A path bug
-// is therefore not a path bug — it is an outside author choosing a file.
-package notes
-
-import (
-	"errors"
-	"fmt"
-	"os"
-	"path/filepath"
-	"strings"
-)
-
-// Scope is which part of the tree a caller is allowed to touch.
-type Scope int
-
-const (
-	// ScopeNotes is the model-facing scope: markdown under knowledge/ and
-	// wiki/ only.
-	ScopeNotes Scope = iota
-	// ScopeRoot admits the named governance files and NOTHING else. It exists so
-	// there is an MCP path to CLAUDE.md at all — the absence of one is what
-	// pushed a session to edit via the gitea REST API on 2026-06-16, which
-	// never reached the live tree and wedged brain-sync for hours. It is NOT
-	// reachable from the model-facing toolset; see tools_notes.go.
-	ScopeRoot
-)
-
-// rootFiles is an exact-name allowlist, deliberately not a "root *.md" glob.
-//
-// Two reasons. log.md is gitignored, so an edit to it applies to the live tree
-// and never reaches gitea — the exact shape of brain#2, admitted by a glob. And
-// a glob auto-admits whatever governance file appears next (AGENTS.md, a
-// bootstrap doc) with nobody reviewing that decision.
-var rootFiles = map[string]bool{"CLAUDE.md": true}
-
-// noteDirs are the two trees that hold notes.
-var noteDirs = []string{"knowledge/", "wiki/"}
-
-// deniedPrefixes are refused in every scope, independent of the allowlist.
-//
-// A static backstop rather than a consequence of the allowlist being right:
-// .git/hooks/post-commit is executed by brain-sync inside a pod holding the
-// Gitea push credentials, and archive/ + sessions/ hold verbatim session
-// transcripts that BM25 never indexes and so nobody thinks of as reachable.
-var deniedPrefixes = []string{".git/", "archive/", "sessions/", "raw/", "training-data/", ".obsidian/"}
-
-// Errors are sentinels so callers can distinguish a refusal from an I/O fault.
-var (
-	ErrOutsideBrain  = errors.New("notes: path escapes the brain dir")
-	ErrNotAllowed    = errors.New("notes: path is not editable through this tool")
-	ErrNotSyncSource = errors.New("notes: brain dir is not the sync source")
-)
-
-// Target is a resolved, contained path.
-type Target struct {
-	Rel string // brain-relative, cleaned
-	Abs string // absolute, symlink-checked
-}
-
-// Resolve canonicalises path, then checks it against the scope's allowlist,
-// then re-checks containment after symlink evaluation.
-//
-// Order matters and is the point: a prefix test on the raw argument accepts
-// "knowledge/../.git/hooks/post-commit", because Clean only collapses it
-// afterwards.
-func Resolve(brainDir, path string, scope Scope) (Target, error) {
-	// Note: the sync-source assertion lives on the WRITE path (Edit), not
-	// here. brain#2 was an edit landing where the sync could not commit it; a
-	// read from such a tree is merely a read.
-
-	// 1. Canonicalise. Rooting at "/" makes Clean collapse every ".." that
-	//    would otherwise escape, and ToSlash normalises separators first.
-	clean := strings.TrimPrefix(filepath.Clean("/"+filepath.ToSlash(path)), "/")
-	if clean == "" || clean == "." {
-		return Target{}, fmt.Errorf("%w: empty path", ErrNotAllowed)
-	}
-
-	// 2. Static denials, before any allowlist reasoning.
-	for _, d := range deniedPrefixes {
-		if strings.HasPrefix(clean+"/", d) {
-			return Target{}, fmt.Errorf("%w: %q is not note content", ErrNotAllowed, clean)
-		}
-	}
-	if strings.HasPrefix(filepath.Base(clean), ".") {
-		return Target{}, fmt.Errorf("%w: dotfiles are not editable", ErrNotAllowed)
-	}
-
-	// 3. Scope allowlist.
-	if err := allow(clean, scope); err != nil {
-		return Target{}, err
-	}
-
-	// 4. Containment, lexically.
-	abs := filepath.Join(brainDir, filepath.FromSlash(clean))
-	if !within(brainDir, abs) {
-		return Target{}, fmt.Errorf("%w: %q", ErrOutsideBrain, path)
-	}
-
-	// 5. Containment again, after resolving symlinks. The tree is Syncthing
-	//    managed, so a link can appear without anyone adding one on purpose;
-	//    a symlinked note or directory would otherwise read and write outside
-	//    the brain entirely.
-	if err := assertNoSymlinkEscape(brainDir, abs); err != nil {
-		return Target{}, err
-	}
-
-	return Target{Rel: clean, Abs: abs}, nil
-}
-
-// allow enforces the scope's allowlist. The two scopes are DISJOINT, not
-// nested: the privileged root scope reaches governance files and nothing else,
-// so the tool that carries the higher privilege carries the smaller reach.
-func allow(clean string, scope Scope) error {
-	if scope == ScopeRoot {
-		if !rootFiles[clean] {
-			return fmt.Errorf("%w: %q is not a governance file", ErrNotAllowed, clean)
-		}
-		return nil
-	}
-	if !isNotePath(clean) {
-		return fmt.Errorf("%w: %q is outside knowledge/ and wiki/", ErrNotAllowed, clean)
-	}
-	return nil
-}
-
-func isNotePath(clean string) bool {
-	var inDir bool
-	for _, d := range noteDirs {
-		if strings.HasPrefix(clean, d) {
-			inDir = true
-			break
-		}
-	}
-	if !inDir || filepath.Ext(clean) != ".md" {
-		return false
-	}
-	// _index.md is generated per wing, and brain-sync's conflict resolver
-	// deliberately resolves it in origin's favour — an edit here is reverted
-	// by design, so accepting one would be a lie.
-	return filepath.Base(clean) != "_index.md"
-}
-
-func within(root, abs string) bool {
-	rel, err := filepath.Rel(root, abs)
-	if err != nil {
-		return false
-	}
-	return rel != ".." && !strings.HasPrefix(rel, ".."+string(filepath.Separator))
-}
-
-// assertNoSymlinkEscape resolves the deepest existing ancestor of abs and
-// requires it to still be inside brainDir. The file itself need not exist
-// (a create is legal); its directory chain must be real and contained.
-func assertNoSymlinkEscape(brainDir, abs string) error {
-	if fi, err := os.Lstat(abs); err == nil && fi.Mode()&os.ModeSymlink != 0 {
-		return fmt.Errorf("%w: %q is a symlink", ErrNotAllowed, abs)
-	}
-
-	realRoot, err := filepath.EvalSymlinks(brainDir)
-	if err != nil {
-		return fmt.Errorf("notes: resolve brain dir: %w", err)
-	}
-
-	dir := filepath.Dir(abs)
-	for {
-		resolved, err := filepath.EvalSymlinks(dir)
-		if err == nil {
-			if !within(realRoot, resolved) {
-				return fmt.Errorf("%w: %q resolves outside the brain dir", ErrOutsideBrain, dir)
-			}
-			return nil
-		}
-		if !os.IsNotExist(err) {
-			return fmt.Errorf("notes: resolve %q: %w", dir, err)
-		}
-		parent := filepath.Dir(dir)
-		if parent == dir {
-			return fmt.Errorf("%w: no existing ancestor for %q", ErrOutsideBrain, abs)
-		}
-		dir = parent
-	}
-}
-
-// assertSyncSource refuses a brain dir that is not a git working tree.
-//
-// brain#2 was an edit landing on a directory the sync does not commit from.
-// That cannot be prevented by review — a wrong INGEST_BRAIN_DIR in a future
-// manifest reintroduces it while every unit test still passes — so it is
-// asserted at runtime, the same check brain-sync itself makes before running.
-func assertSyncSource(brainDir string) error {
-	if fi, err := os.Stat(filepath.Join(brainDir, ".git")); err != nil || !fi.IsDir() {
-		return fmt.Errorf("%w: %q has no .git, so an edit there would never be committed",
-			ErrNotSyncSource, brainDir)
-	}
-	return nil
-}

ingestion/internal/notes/path_test.go

@@ -1,146 +0,0 @@
-package notes
-
-import (
-	"os"
-	"path/filepath"
-	"strings"
-	"testing"
-)
-
-// newBrain lays out a tree shaped like the live one: a git dir, note dirs,
-// and the non-note areas that must never be reachable.
-func newBrain(t *testing.T) string {
-	t.Helper()
-	dir := t.TempDir()
-	for _, d := range []string{
-		".git/hooks", "knowledge", "wiki/homelab/facts", "archive/claude-sessions/koala",
-		"sessions", "raw", ".obsidian",
-	} {
-		if err := os.MkdirAll(filepath.Join(dir, d), 0o755); err != nil {
-			t.Fatal(err)
-		}
-	}
-	write := func(p, s string) {
-		t.Helper()
-		if err := os.WriteFile(filepath.Join(dir, p), []byte(s), 0o644); err != nil {
-			t.Fatal(err)
-		}
-	}
-	write("CLAUDE.md", "# instructions\n")
-	write("log.md", "ignored scratch\n")
-	write("knowledge/note.md", "# note\n")
-	write("wiki/homelab/facts/f.md", "# fact\n")
-	write("wiki/homelab/_index.md", "# index\n")
-	write("archive/claude-sessions/koala/session-1.md", "verbatim transcript\n")
-	write("sessions/s.jsonl", "{}\n")
-	write(".git/hooks/post-commit", "#!/bin/sh\n")
-	return dir
-}
-
-func TestResolve_AcceptsNotePaths(t *testing.T) {
-	dir := newBrain(t)
-	for _, p := range []string{"knowledge/note.md", "wiki/homelab/facts/f.md"} {
-		got, err := Resolve(dir, p, ScopeNotes)
-		if err != nil {
-			t.Errorf("Resolve(%q): %v", p, err)
-			continue
-		}
-		if !strings.HasPrefix(got.Abs, dir) {
-			t.Errorf("Resolve(%q).Abs = %q, want inside %q", p, got.Abs, dir)
-		}
-	}
-}
-
-func TestResolve_RefusesEscapesAndNonNoteAreas(t *testing.T) {
-	dir := newBrain(t)
-
-	// Canonicalisation must happen BEFORE the allowlist check. A prefix test
-	// on the raw argument accepts every one of these: "knowledge/..%2f" style
-	// inputs collapse to .git, and .git/hooks/post-commit is executed by
-	// brain-sync inside a pod holding the Gitea push credentials.
-	refuse := []string{
-		"knowledge/../.git/hooks/post-commit",
-		"wiki/../.git/config",
-		"./knowledge/../.git/config",
-		"knowledge//../.git/config",
-		"../../etc/passwd",
-		"/etc/passwd",
-		".git/config",
-		"archive/claude-sessions/koala/session-1.md", // verbatim transcripts
-		"sessions/s.jsonl",
-		"raw/x.md",
-		".obsidian/workspace.json",
-		"log.md",                 // gitignored: an edit here would never sync (brain#2)
-		"wiki/homelab/_index.md", // generated; brain-sync resolves it in origin's favour
-		"knowledge/note.txt",     // not markdown
-		"CLAUDE.md",              // root file — not reachable in the notes scope
-	}
-	for _, p := range refuse {
-		if _, err := Resolve(dir, p, ScopeNotes); err == nil {
-			t.Errorf("Resolve(%q) = nil error, want refusal", p)
-		}
-	}
-}
-
-func TestResolve_RootScopeAdmitsOnlyNamedFiles(t *testing.T) {
-	dir := newBrain(t)
-
-	if _, err := Resolve(dir, "CLAUDE.md", ScopeRoot); err != nil {
-		t.Errorf("Resolve(CLAUDE.md, ScopeRoot): %v", err)
-	}
-	// log.md is the reason this is an exact-name list and not "root *.md":
-	// it is gitignored, so an edit would apply locally and never reach gitea.
-	for _, p := range []string{"log.md", "AGENTS.md", "knowledge/note.md", ".git/config"} {
-		if _, err := Resolve(dir, p, ScopeRoot); err == nil {
-			t.Errorf("Resolve(%q, ScopeRoot) = nil error, want refusal", p)
-		}
-	}
-}
-
-func TestResolve_RefusesSymlinkedTargets(t *testing.T) {
-	dir := newBrain(t)
-	outside := filepath.Join(t.TempDir(), "secret.md")
-	if err := os.WriteFile(outside, []byte("secret\n"), 0o644); err != nil {
-		t.Fatal(err)
-	}
-	// The tree is Syncthing-managed, so a symlink can appear without anyone
-	// adding one deliberately. Containment must survive it.
-	if err := os.Symlink(outside, filepath.Join(dir, "knowledge/link.md")); err != nil {
-		t.Skipf("symlinks unavailable: %v", err)
-	}
-	if _, err := Resolve(dir, "knowledge/link.md", ScopeNotes); err == nil {
-		t.Error("Resolve followed a symlink out of the brain dir")
-	}
-
-	if err := os.Symlink(filepath.Dir(outside), filepath.Join(dir, "wiki/escape")); err != nil {
-		t.Skipf("symlinks unavailable: %v", err)
-	}
-	if _, err := Resolve(dir, "wiki/escape/secret.md", ScopeNotes); err == nil {
-		t.Error("Resolve followed a symlinked directory out of the brain dir")
-	}
-}
-
-func TestResolve_RefusesWhenTheTreeIsNotTheSyncSource(t *testing.T) {
-	// brain#2 was "wrote to a directory the sync does not commit from". No
-	// code review prevents that recurring — a wrong INGEST_BRAIN_DIR in a
-	// future manifest reintroduces it and every unit test still passes. So
-	// assert the property at runtime, the way brain-sync itself does.
-	dir := t.TempDir()
-	if err := os.MkdirAll(filepath.Join(dir, "knowledge"), 0o755); err != nil {
-		t.Fatal(err)
-	}
-	if err := os.WriteFile(filepath.Join(dir, "knowledge/note.md"), []byte("x"), 0o644); err != nil {
-		t.Fatal(err)
-	}
-	// Reads are fine anywhere; the guard belongs to writes.
-	if _, err := Resolve(dir, "knowledge/note.md", ScopeNotes); err != nil {
-		t.Fatalf("Resolve should not require .git for a read: %v", err)
-	}
-	_, err := Edit(dir, "knowledge/note.md", "x", "y", ScopeNotes)
-	if err == nil {
-		t.Fatal("Edit accepted a tree with no .git — the write would never be committed")
-	}
-	if !strings.Contains(err.Error(), "sync source") {
-		t.Errorf("error should name the cause, got %v", err)
-	}
-}

ingestion/internal/pipeline/build.go

@@ -76,9 +76,6 @@ func buildFrontmatter(rp RawPage, date string) string {
 		}
 		fmt.Fprintf(&sb, "date_ingested: %s\n", date)
 		fmt.Fprintf(&sb, "last_updated: %s\n", date)
-		if rp.SourceHash != "" {
-			fmt.Fprintf(&sb, "source_hash: %s\n", rp.SourceHash)
-		}
 		if rp.Source != "" {
 			fmt.Fprintf(&sb, "source: %s\n", yamlScalar(rp.Source))
 		}

ingestion/internal/pipeline/parse.go

@@ -20,13 +20,9 @@ type RawPage struct {
 	// ingested content's own frontmatter (see parseContentFrontmatter) — never
 	// set by the LLM. json:"-" keeps them immune to same-named keys the LLM
 	// might emit. Only meaningful for Type == "source".
-	// SourceHash is sha256 of the ingested BODY (frontmatter excluded), stamped
+	Source    string `json:"-"`
-	// so the next ingest of the same source can tell "unchanged" from "edited"
+	Author    string `json:"-"`
-	// without re-running extraction (#105).
+	Published string `json:"-"`
-	SourceHash string `json:"-"`
-	Source     string `json:"-"`
-	Author     string `json:"-"`
-	Published  string `json:"-"`
 }
 
 // ParseRawPages parses LLM output as a JSON array of RawPage objects.
@@ -116,11 +112,6 @@ type sourceMeta struct {
 	Source    string
 	Author    string
 	Published string
-	// BodyHash is sha256 of the content with any leading frontmatter removed.
-	// Body-only on purpose: a re-crawl that stamps a new fetch date has not
-	// changed the source, and treating that as drift would re-extract the
-	// whole corpus every time a crawler ran (#105).
-	BodyHash string
 }
 
 // parseContentFrontmatter extracts source/author/published from a leading
@@ -163,7 +154,6 @@ func applySourceMeta(pages []RawPage, meta sourceMeta) {
 		if pages[i].Type != "source" {
 			continue
 		}
-		pages[i].SourceHash = meta.BodyHash
 		pages[i].Source = meta.Source
 		pages[i].Author = meta.Author
 		pages[i].Published = meta.Published

ingestion/internal/pipeline/pipeline.go

@@ -3,8 +3,6 @@ package pipeline
 
 import (
 	"context"
-	"crypto/sha256"
-	"encoding/hex"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -28,11 +26,6 @@ type Config struct {
 type Result struct {
 	Pages    []string // relative paths written (or would-be written in dry-run)
 	Warnings []string
-	// Skipped reports that the source was byte-identical to the last ingest,
-	// so no extraction ran and nothing was written. Reported rather than
-	// silent: a run that does nothing must say so, or "the pipeline is fine"
-	// and "the pipeline stopped working" look the same (#105, #107).
-	Skipped bool
 }
 
 // Run ingests content and writes structured wiki pages to brainDir/wiki/.
@@ -50,18 +43,6 @@ func Run(ctx context.Context, cfg Config, brainDir, content, source string, dryR
 
 	sourceSlug := wiki.Slug(source)
 	date := time.Now().UTC().Format("2006-01-02")
-
-	// Drift check BEFORE any extraction: an unchanged source costs a full LLM
-	// pass over every chunk to produce a result that merges to nothing (#105).
-	// The merge is already idempotent (#103), so this is cost and signal, not
-	// correctness — which is why it is safe for it to be an early return.
-	bodyHash := hashBody(content)
-	if !dryRun && bodyHash != "" && bodyHash == storedSourceHash(brainDir, sourceSlug) {
-		return Result{Skipped: true, Warnings: []string{
-			fmt.Sprintf("source %q unchanged since last ingest (hash %s) — extraction skipped", source, bodyHash[:12]),
-		}}, nil
-	}
-
 	chunks := Chunk(content, cfg.ChunkSize)
 
 	var allRaw []RawPage
@@ -78,9 +59,7 @@ func Run(ctx context.Context, cfg Config, brainDir, content, source string, dryR
 		allWarnings = append(allWarnings, warnings...)
 	}
 
-	meta := parseContentFrontmatter(content)
+	applySourceMeta(allRaw, parseContentFrontmatter(content))
-	meta.BodyHash = bodyHash
-	applySourceMeta(allRaw, meta)
 
 	return buildAndWrite(allRaw, sourceSlug, date, brainDir, source, inventory, allWarnings, dryRun)
 }
@@ -117,11 +96,7 @@ func buildAndWrite(rawPages []RawPage, sourceSlug, date, brainDir, source string
 			if err := os.MkdirAll(filepath.Dir(dest), 0o755); err != nil {
 				return Result{}, fmt.Errorf("mkdir for %s: %w", page.Path, err)
 			}
-			content, err := reviseOrCreate(dest, page)
+			if err := os.WriteFile(dest, []byte(page.Content), 0o644); err != nil {
-			if err != nil {
-				return Result{}, err
-			}
-			if err := os.WriteFile(dest, []byte(content), 0o644); err != nil {
 				return Result{}, fmt.Errorf("write %s: %w", page.Path, err)
 			}
 		}
@@ -140,75 +115,6 @@ func buildAndWrite(rawPages []RawPage, sourceSlug, date, brainDir, source string
 	return Result{Pages: written, Warnings: warnings}, nil
 }
 
-// hashBody returns sha256 of content with any leading frontmatter block
-// removed, or "" for empty content.
-//
-// Body-only on purpose: a re-crawl that stamps a new fetch date has not changed
-// the source, and treating that as drift would re-extract the corpus every time
-// a crawler ran (#105).
-func hashBody(content string) string {
-	body := content
-	if strings.HasPrefix(body, "---\n") {
-		if _, rest, found := strings.Cut(body[4:], "\n---"); found {
-			body = strings.TrimPrefix(rest, "\n")
-		}
-	}
-	if strings.TrimSpace(body) == "" {
-		return ""
-	}
-	sum := sha256.Sum256([]byte(body))
-	return hex.EncodeToString(sum[:])
-}
-
-// storedSourceHash reads source_hash from the source page a previous ingest
-// wrote, or "" when there is no such page or no such field.
-//
-// Absence always means "extract". That is the fail-safe direction: a missed
-// skip costs one extraction, while a wrong skip loses an update silently — and
-// silence is the failure mode this repo keeps paying for.
-func storedSourceHash(brainDir, sourceSlug string) string {
-	raw, err := os.ReadFile(filepath.Join(brainDir, "wiki", "sources", sourceSlug+".md"))
-	if err != nil {
-		return ""
-	}
-	for _, line := range strings.Split(string(raw), "\n") {
-		if key, value, found := strings.Cut(line, ":"); found && strings.TrimSpace(key) == "source_hash" {
-			return strings.TrimSpace(value)
-		}
-	}
-	return ""
-}
-
-// reviseOrCreate returns the bytes to write for one extracted page: merged into
-// whatever is already on disk, or the page as-is when the path is new.
-//
-// This is the compile half of compile-on-ingest. Before it, the write was an
-// unconditional os.WriteFile, so re-ingesting a source replaced its page
-// wholesale and discarded everything accumulated since — including human edits
-// (hyperguild#43: "re-ingest overwrites wholesale").
-//
-// The merge is deliberately asymmetric in the existing page's favour:
-// wiki.Merge keeps the on-disk frontmatter and the on-disk version of any
-// section both sides carry, adds sections only the extraction produced, and
-// unions bullet lists. So a freshly extracted page can add to a note but never
-// silently rewrite what a human put there — which is what makes it safe to run
-// this on every ingest rather than behind a review gate.
-//
-// Known limitation: because the on-disk frontmatter wins, `last_updated` keeps
-// its first-ingest date on a revised page. Left deliberately — the alternative
-// is this function editing frontmatter it does not own, and no lint reads that
-// field today.
-func reviseOrCreate(dest string, page wiki.Page) (string, error) {
-	existing, err := os.ReadFile(dest)
-	switch {
-	case os.IsNotExist(err):
-		return page.Content, nil
-	case err != nil:
-		return "", fmt.Errorf("read existing %s: %w", page.Path, err)
-	}
-	return wiki.Merge(wiki.Page{Path: page.Path, Content: string(existing)}, page).Content, nil
-}
-
 // mergeAll deduplicates pages by path, merging content from later occurrences.
 func mergeAll(pages []wiki.Page) []wiki.Page {
 	order := make([]string, 0, len(pages))

ingestion/internal/pipeline/pipeline_test.go

@@ -171,125 +171,3 @@ func mustJSON(v any) string {
 	}
 	return string(b)
 }
-
-// --- B1: compile-on-ingest — revise the existing page, never clobber it -----
-
-func TestRunRaw_MergesIntoAnExistingPageInsteadOfOverwritingIt(t *testing.T) {
-	// Before this, buildAndWrite did an unconditional os.WriteFile: re-ingesting
-	// a source replaced its page wholesale, discarding anything accumulated
-	// since — including human edits. hyperguild#43 recorded the symptom as
-	// "re-ingest overwrites wholesale".
-	dir := t.TempDir()
-	page := filepath.Join(dir, "wiki", "sources", "shape-up.md")
-	require.NoError(t, os.MkdirAll(filepath.Dir(page), 0o755))
-	require.NoError(t, os.WriteFile(page, []byte(`---
-title: 'Shape Up'
----
-
-## Summary
-
-A book about shaping product work.
-
-## My Take
-
-Read this before the next planning cycle.
-`), 0o644))
-
-	_, err := RunRaw(dir, "shape-up", []RawPage{{
-		Title: "Shape Up", Type: "source", Subtype: "book", Domain: "product-strategy",
-		Content: "## Summary\n\nA book about shaping product work.\n\n## Key Claims\n\n- Appetite beats estimation.\n",
-	}}, false)
-	require.NoError(t, err)
-
-	got, err := os.ReadFile(page)
-	require.NoError(t, err)
-	s := string(got)
-
-	assert.Contains(t, s, "## My Take", "a section the extraction never saw must survive the merge")
-	assert.Contains(t, s, "Read this before the next planning cycle.")
-	assert.Contains(t, s, "Appetite beats estimation.", "newly extracted material must still land")
-}
-
-func TestRunRaw_ReIngestingUnchangedContentIsByteIdentical(t *testing.T) {
-	// Compile-on-ingest runs on every ingest, so "nothing changed" must produce
-	// no diff at all. Otherwise every re-ingest dirties the tree, brain-sync
-	// commits it, and the git history fills with noise that hides real edits.
-	dir := t.TempDir()
-	raw := []RawPage{{
-		Title: "Shape Up", Type: "source", Subtype: "book", Domain: "product-strategy",
-		Content: "## Summary\n\nA book about shaping product work.\n\n## Open Questions\n\n- Does appetite scale?\n",
-	}}
-
-	_, err := RunRaw(dir, "shape-up", raw, false)
-	require.NoError(t, err)
-	first, err := os.ReadFile(filepath.Join(dir, "wiki", "sources", "shape-up.md"))
-	require.NoError(t, err)
-
-	_, err = RunRaw(dir, "shape-up", raw, false)
-	require.NoError(t, err)
-	second, err := os.ReadFile(filepath.Join(dir, "wiki", "sources", "shape-up.md"))
-	require.NoError(t, err)
-
-	assert.Equal(t, string(first), string(second),
-		"re-ingesting unchanged content must leave the page byte-identical")
-}
-
-// --- #105: source drift — an unchanged re-ingest must not re-extract --------
-
-func TestRun_SkipsExtractionWhenTheSourceIsUnchanged(t *testing.T) {
-	// #103 made a re-ingest harmless (byte-identical merge). It is still not
-	// free: the full LLM extraction runs over every chunk to produce a result
-	// that merges to nothing. This is the cost half.
-	dir := t.TempDir()
-	var calls int
-	cfg := Config{Complete: func(_ context.Context, _, _ string) (string, error) {
-		calls++
-		return `[{"title":"Shape Up","type":"source","subtype":"book","domain":"product","content":"## Summary\n\nA book.\n"}]`, nil
-	}}
-
-	content := "---\nsource: https://example.com/shape-up\n---\n\nThe body of the article.\n"
-
-	first, err := Run(context.Background(), cfg, dir, content, "shape-up", false)
-	require.NoError(t, err)
-	require.Equal(t, 1, calls, "first ingest must extract")
-	assert.False(t, first.Skipped)
-
-	second, err := Run(context.Background(), cfg, dir, content, "shape-up", false)
-	require.NoError(t, err)
-	assert.Equal(t, 1, calls, "unchanged content must not be extracted again")
-	assert.True(t, second.Skipped, "the skip must be reported, not silent")
-}
-
-func TestRun_ReExtractsWhenTheSourceBodyChanged(t *testing.T) {
-	dir := t.TempDir()
-	var calls int
-	cfg := Config{Complete: func(_ context.Context, _, _ string) (string, error) {
-		calls++
-		return `[{"title":"Shape Up","type":"source","subtype":"book","domain":"product","content":"## Summary\n\nA book.\n"}]`, nil
-	}}
-
-	_, err := Run(context.Background(), cfg, dir, "---\nsource: x\n---\n\nversion one\n", "shape-up", false)
-	require.NoError(t, err)
-	_, err = Run(context.Background(), cfg, dir, "---\nsource: x\n---\n\nversion two — the source was edited\n", "shape-up", false)
-	require.NoError(t, err)
-
-	assert.Equal(t, 2, calls, "changed content must be re-extracted")
-}
-
-func TestRun_FrontmatterOnlyChangeIsNotDrift(t *testing.T) {
-	// The hash covers the body, so re-fetching a page whose metadata moved
-	// (a re-crawl stamping a new date) is not treated as the source changing.
-	dir := t.TempDir()
-	var calls int
-	cfg := Config{Complete: func(_ context.Context, _, _ string) (string, error) {
-		calls++
-		return `[{"title":"Shape Up","type":"source","subtype":"book","domain":"product","content":"## Summary\n\nA book.\n"}]`, nil
-	}}
-
-	_, err := Run(context.Background(), cfg, dir, "---\nsource: x\nfetched: monday\n---\n\nsame body\n", "shape-up", false)
-	require.NoError(t, err)
-	_, err = Run(context.Background(), cfg, dir, "---\nsource: x\nfetched: tuesday\n---\n\nsame body\n", "shape-up", false)
-	require.NoError(t, err)
-
-	assert.Equal(t, 1, calls, "only the body counts as the source")
-}

ingestion/internal/wiki/merge.go

@@ -34,7 +34,7 @@ type section struct {
 // all others keep a's version. Sections in b not present in a are appended.
 func Merge(a, b Page) Page {
 	fmA, secsA := parseSections(a.Content)
-	fmB, secsB := parseSections(b.Content)
+	_, secsB := parseSections(b.Content)
 
 	idx := make(map[string]int, len(secsA))
 	for i, s := range secsA {
@@ -53,60 +53,11 @@ func Merge(a, b Page) Page {
 		case bulletSections[sB.heading]:
 			secsA[i].content = mergeBullets(sA.content, sB.content)
 		case appendSections[sB.heading]:
-			secsA[i].content = appendNew(sA.content, sB.content)
+			secsA[i].content = strings.TrimRight(sA.content, "\n") + "\n\n" + strings.TrimLeft(sB.content, "\n")
 		}
 	}
 
-	return Page{Path: a.Path, Content: rebuildContent(refreshOwned(fmA, fmB), secsA)}
+	return Page{Path: a.Path, Content: rebuildContent(fmA, secsA)}
-}
-
-// generatorOwned names the frontmatter fields the ingest pipeline may refresh
-// on a page it is revising. Everything else on disk wins.
-//
-// #103 made the on-disk frontmatter win wholesale, which is what stops a
-// regenerating writer from overwriting human-set metadata — a title someone
-// fixed, or the claim-property envelope (brain#21). The cost was that fields
-// the generator legitimately owns froze at their first-ingest values: when it
-// last ran, and what it last saw.
-//
-// An explicit allowlist rather than a carve-out: the ownership boundary is
-// nameable, and a field nobody has thought about stays human-owned by default,
-// which is the safe direction.
-var generatorOwned = map[string]bool{
-	"last_updated": true,
-	"source_hash":  true,
-}
-
-// refreshOwned returns a's frontmatter with the generator-owned fields taken
-// from b where b supplies them. Fields absent from b keep a's value, so a
-// generator that stops emitting a field cannot blank it.
-func refreshOwned(a, b string) string {
-	bVals := make(map[string]string)
-	for _, line := range strings.Split(b, "\n") {
-		key, value, found := strings.Cut(line, ":")
-		if !found || !generatorOwned[strings.TrimSpace(key)] {
-			continue
-		}
-		bVals[strings.TrimSpace(key)] = strings.TrimSpace(value)
-	}
-	if len(bVals) == 0 {
-		return a
-	}
-
-	out := make([]string, 0, len(strings.Split(a, "\n")))
-	for _, line := range strings.Split(a, "\n") {
-		key, _, found := strings.Cut(line, ":")
-		k := strings.TrimSpace(key)
-		if found && generatorOwned[k] {
-			if v, ok := bVals[k]; ok {
-				out = append(out, k+": "+v)
-				delete(bVals, k)
-				continue
-			}
-		}
-		out = append(out, line)
-	}
-	return strings.Join(out, "\n")
 }
 
 func parseSections(markdown string) (frontmatter string, sections []section) {
@@ -145,64 +96,15 @@ func parseSections(markdown string) (frontmatter string, sections []section) {
 	return
 }
 
-// rebuildContent serialises sections back into a page.
-//
-// Each section body is normalised to exactly one trailing newline and no
-// leading blank line. Without that, a section keeps whatever blank lines it was
-// parsed with and this function adds its own, so every merge pass grows the page
-// by a blank line — invisible in a diff viewer, fatal to byte-stability. Compile-on-ingest
-// merges on every run, so "merging changes nothing when nothing changed" has to
-// hold at the byte level, not just the content level.
 func rebuildContent(frontmatter string, sections []section) string {
 	var sb strings.Builder
 	sb.WriteString(frontmatter)
 	for _, sec := range sections {
-		body := strings.Trim(sec.content, "\n")
+		fmt.Fprintf(&sb, "\n## %s\n\n%s", sec.heading, sec.content)
-		fmt.Fprintf(&sb, "\n## %s\n\n%s\n", sec.heading, body)
 	}
 	return sb.String()
 }
 
-// appendNew concatenates the lines of b that a does not already carry.
-//
-// Append sections used to concatenate wholesale, which is correct exactly once.
-// Compile-on-ingest merges a freshly extracted page into the one already on
-// disk, so an unchanged source re-ingested would grow "Open Questions" and
-// "Updates" on every run until the page is unreadable — and the drift guard
-// that would otherwise catch it (hashing the source body) does not exist yet,
-// so idempotency has to hold here rather than upstream.
-//
-// Line-level rather than block-level: the common case is a re-ingest carrying
-// one genuinely new line alongside several it already has. A block-level
-// "skip if identical" would duplicate the old lines every time that happened.
-//
-// The cost is that a line repeated verbatim on purpose collapses to one. For
-// these sections — questions, updates, evolving notes — a repeat is noise
-// rather than signal, and the failure is conservative: the page stops growing
-// instead of growing wrongly.
-func appendNew(a, b string) string {
-	seen := make(map[string]bool)
-	for _, line := range strings.Split(a, "\n") {
-		if t := strings.TrimSpace(line); t != "" {
-			seen[t] = true
-		}
-	}
-
-	var add []string
-	for _, line := range strings.Split(b, "\n") {
-		t := strings.TrimSpace(line)
-		if t == "" || seen[t] {
-			continue
-		}
-		seen[t] = true
-		add = append(add, line)
-	}
-	if len(add) == 0 {
-		return a // nothing new — leave the section byte-identical
-	}
-	return strings.TrimRight(a, "\n") + "\n\n" + strings.Join(add, "\n") + "\n"
-}
-
 func mergeBullets(a, b string) string {
 	seen := make(map[string]bool)
 	var lines []string

ingestion/internal/wiki/merge_test.go

@@ -53,93 +53,3 @@ func TestMerge_KeepsFrontmatterFromA(t *testing.T) {
 	assert.Contains(t, got.Content, "title: A")
 	assert.NotContains(t, got.Content, "title: B")
 }
-
-// --- brain#21/B1: merging must be safe to run again -------------------------
-
-func TestMerge_AppendSectionDoesNotDuplicateContentAlreadyPresent(t *testing.T) {
-	// Compile-on-ingest merges a freshly extracted page into the one already
-	// on disk. Bullet sections union, so they are naturally idempotent — but
-	// append sections concatenate, so re-ingesting an unchanged source would
-	// grow "Open Questions" on every run until the page is unreadable.
-	page := Page{Path: "wiki/sources/x.md", Content: `---
-title: X
----
-
-## Open Questions
-
-- Does this converge?
-`}
-
-	once := Merge(page, page)
-	twice := Merge(once, page)
-
-	assert.Equal(t, 1, strings.Count(once.Content, "Does this converge?"),
-		"merging a page with itself must not duplicate an append section")
-	assert.Equal(t, once.Content, twice.Content,
-		"merge must be idempotent — a third pass may not keep growing the page")
-}
-
-func TestMerge_AppendSectionStillAccumulatesGenuinelyNewContent(t *testing.T) {
-	// The dedup must not turn append sections into keep-a-only sections:
-	// new material is exactly what compile-on-ingest exists to add.
-	existing := Page{Path: "wiki/sources/x.md", Content: `---
-title: X
----
-
-## Open Questions
-
-- Does this converge?
-`}
-	fresh := Page{Path: "wiki/sources/x.md", Content: `---
-title: X
----
-
-## Open Questions
-
-- What happens under load?
-`}
-
-	got := Merge(existing, fresh).Content
-	assert.Contains(t, got, "Does this converge?", "existing question must survive")
-	assert.Contains(t, got, "What happens under load?", "new question must be added")
-}
-
-func TestMerge_GeneratorOwnedFrontmatterFieldsAreRefreshed(t *testing.T) {
-	// #103 made on-disk frontmatter win wholesale, which is what protects
-	// human-set fields from a regenerating writer. The cost was that fields the
-	// generator legitimately owns — when it last ran, what it last saw — froze
-	// at their first-ingest values. An explicit owned-set is the boundary:
-	// named fields the generator may refresh, everything else human-owned.
-	existing := Page{Path: "wiki/sources/x.md", Content: `---
-title: 'X'
-last_updated: 2026-01-01
-source_hash: aaaa
-half_life: durable
-claim_provenance: asserted
----
-
-## Summary
-
-Original.
-`}
-	fresh := Page{Path: "wiki/sources/x.md", Content: `---
-title: 'Renamed by the model'
-last_updated: 2026-08-22
-source_hash: bbbb
----
-
-## Summary
-
-Rewritten by the model.
-`}
-
-	got := Merge(existing, fresh).Content
-
-	assert.Contains(t, got, "last_updated: 2026-08-22", "generator owns last_updated")
-	assert.Contains(t, got, "source_hash: bbbb", "generator owns source_hash")
-	assert.Contains(t, got, "title: 'X'", "a human-set title must survive regeneration")
-	assert.Contains(t, got, "half_life: durable", "the claim envelope must survive regeneration")
-	assert.Contains(t, got, "claim_provenance: asserted")
-	assert.Contains(t, got, "Original.", "an existing section still wins over the model's rewrite")
-	assert.NotContains(t, got, "Renamed by the model")
-}