fix(audit): each ntfy alert source sends its own title (#163)

Every alert was titled "brain-capture audit degraded", including the
symlink tripwire's and governance-edit alerts. NtfyNotifier.WithTitle
returns a titled copy (nil stays nil); buildNotifier(getenv, title) is
called per source: capture audit (unchanged title), "brain symlink
tripwire", "brain governance edit". Tests assert the Title header.

Fixes #163.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

ingestion/cmd/server/main.go

@@ -179,9 +179,12 @@ func alertingWarnings(getenv func(string) string) []string {
 	return out
 }
 
-func buildNotifier() audit.Notifier {
-	if n := audit.NewNtfyNotifier(os.Getenv("BRAIN_NTFY_URL"), os.Getenv("BRAIN_NTFY_TOKEN")); n != nil {
-		return n
+// buildNotifier returns the ntfy notifier for one alert source, titled so
+// the source is recognisable (hyperguild#163), or nil when ntfy is not
+// configured.
+func buildNotifier(getenv func(string) string, title string) audit.Notifier {
+	if n := audit.NewNtfyNotifier(getenv("BRAIN_NTFY_URL"), getenv("BRAIN_NTFY_TOKEN")); n != nil {
+		return n.WithTitle(title)
 	}
 	return nil
 }
@@ -203,7 +206,7 @@ func buildAuditSink(ctx context.Context, brainDir string, logger *slog.Logger) c
 		logger.Error("capture audit buffer init", "err", err)
 		os.Exit(1)
 	}
-	notifier := buildNotifier()
+	notifier := buildNotifier(os.Getenv, "brain-capture audit degraded")
 	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()))
@@ -366,7 +369,7 @@ func main() {
 
 	ctx := context.Background()
 	// hyperguild#157: report a symlink that appears in the brain while running.
-	go symlinkguard.Watch(ctx, brainDir, symlinkScanInterval(os.Getenv), buildNotifier())
+	go symlinkguard.Watch(ctx, brainDir, symlinkScanInterval(os.Getenv), buildNotifier(os.Getenv, "brain symlink tripwire"))
 
 	// Never fatal on an unreachable issuer (#83): on a cold cluster boot this
 	// pod can beat dex to serving and get a 502 from ingress, and exiting meant
@@ -546,7 +549,7 @@ func main() {
 		// 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())
+		mcpSrv.WithGovernanceObserver(auditSink, buildNotifier(os.Getenv, "brain governance edit"))
 		logger.Info("capture enabled (REST + MCP tool)", "sovereign_principals", len(sovereign),
 			"governance_observer", true)
 	} else {

ingestion/cmd/server/symlink_check_test.go

@@ -1,6 +1,9 @@
 package main
 
 import (
+	"context"
+	"net/http"
+	"net/http/httptest"
 	"os"
 	"path/filepath"
 	"strings"
@@ -74,3 +77,16 @@ func TestStartupSymlinkCheckRefusesABrainWithAFIFO(t *testing.T) {
 	require.Error(t, err)
 	assert.Contains(t, err.Error(), "classification.yaml")
 }
+
+// hyperguild#163: each alert source gets its own ntfy title.
+func TestBuildNotifierUsesTheGivenTitle(t *testing.T) {
+	var got string
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { got = r.Header.Get("Title") }))
+	defer srv.Close()
+	env := map[string]string{"BRAIN_NTFY_URL": srv.URL}
+	n := buildNotifier(func(k string) string { return env[k] }, "brain symlink tripwire")
+	require.NotNil(t, n)
+	require.NoError(t, n.Notify(context.Background(), "m"))
+	assert.Equal(t, "brain symlink tripwire", got)
+	assert.Nil(t, buildNotifier(func(string) string { return "" }, "x"), "no ntfy URL, no notifier")
+}

ingestion/internal/audit/ntfy.go

@@ -13,9 +13,14 @@ import (
 type NtfyNotifier struct {
 	topicURL string
 	token    string
+	title    string
 	http     *http.Client
 }
 
+// defaultNtfyTitle is the title of a notifier built without WithTitle: the
+// capture audit's degraded-state alert, its first user.
+const defaultNtfyTitle = "brain-capture audit degraded"
+
 // NewNtfyNotifier constructs a notifier for the given ntfy topic URL
 // (e.g. https://ntfy.sh/my-topic). token is an optional bearer for
 // protected ntfy instances; it is held here and only sent in the
@@ -27,17 +32,31 @@ func NewNtfyNotifier(topicURL, token string) *NtfyNotifier {
 	return &NtfyNotifier{
 		topicURL: strings.TrimRight(topicURL, "/"),
 		token:    token,
+		title:    defaultNtfyTitle,
 		http:     &http.Client{Timeout: 10 * time.Second},
 	}
 }
 
+// WithTitle returns a copy that sends title as the ntfy Title header, so each
+// alert source (the capture audit, the symlink tripwire, governance edits)
+// is recognisable on the phone (hyperguild#163). A nil notifier (ntfy not
+// configured) stays nil.
+func (n *NtfyNotifier) WithTitle(title string) *NtfyNotifier {
+	if n == nil {
+		return nil
+	}
+	c := *n
+	c.title = title
+	return &c
+}
+
 // Notify posts a message to the ntfy topic.
 func (n *NtfyNotifier) Notify(ctx context.Context, msg string) error {
 	req, err := http.NewRequestWithContext(ctx, http.MethodPost, n.topicURL, strings.NewReader(msg))
 	if err != nil {
 		return err
 	}
-	req.Header.Set("Title", "brain-capture audit degraded")
+	req.Header.Set("Title", n.title)
 	req.Header.Set("Priority", "high")
 	req.Header.Set("Tags", "warning,brain")
 	if n.token != "" {

ingestion/internal/audit/ntfy_title_test.go

@@ -0,0 +1,29 @@
+package audit
+
+import (
+	"context"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+// hyperguild#163: every alert went out titled "brain-capture audit
+// degraded", including the symlink tripwire's and governance alerts.
+func TestNtfyNotifierSendsItsOwnTitle(t *testing.T) {
+	var got []string
+	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		got = append(got, r.Header.Get("Title"))
+	}))
+	defer srv.Close()
+	base := NewNtfyNotifier(srv.URL, "")
+	require.NoError(t, base.Notify(context.Background(), "m"))
+	require.NoError(t, base.WithTitle("brain symlink tripwire").Notify(context.Background(), "m"))
+	require.NoError(t, base.Notify(context.Background(), "m"))
+	assert.Equal(t, []string{"brain-capture audit degraded", "brain symlink tripwire", "brain-capture audit degraded"}, got,
+		"WithTitle returns a copy; the base keeps its default title")
+	var nilN *NtfyNotifier
+	assert.Nil(t, nilN.WithTitle("x"), "nil (ntfy not configured) stays nil")
+}