feat(chronicle): doctor chronicle_projection_health probe (#2390)

Life Chronicle Phase B.13. An always-run doctor check (keyed off the
event_page_id schema, NOT a migration verify-hook) counts timeline
projections whose event page is soft-deleted — hidden at read time, surfaced
here as a cleanup backlog (`gbrain integrity auto`). Tolerant of pre-migration
brains. 1 detection test. (auto_chronicle / chronicle.tz flags already work
via getConfig defaults; their docs land with document-release at ship.)

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

src/commands/doctor.ts

@@ -538,6 +538,33 @@ export async function doctorReportRemote(engine: BrainEngine): Promise<DoctorRep
     checks.push({ name: 'timeline_dedup_index', status: 'warn', message: 'Could not check idx_timeline_dedup shape' });
   }
 
+  // v0.42.x — Life Chronicle (#2390): orphaned event projections. Reads already
+  // hide projections whose event page is soft-deleted (read-time correctness);
+  // this always-run probe surfaces the cleanup backlog. Keyed off the real
+  // schema (event_page_id), NOT a migration verify-hook, per
+  // migration-verify-hook-never-runs-on-stamped-brains.
+  try {
+    const orphans = await engine.executeRaw<{ n: number }>(
+      `SELECT count(*)::int AS n FROM timeline_entries te
+       JOIN pages ep ON ep.id = te.event_page_id
+       WHERE te.event_page_id IS NOT NULL AND ep.deleted_at IS NOT NULL`,
+    );
+    const n = Number(orphans[0]?.n ?? 0);
+    checks.push(
+      n === 0
+        ? { name: 'chronicle_projection_health', status: 'ok', message: 'No orphaned event projections' }
+        : {
+            name: 'chronicle_projection_health',
+            status: 'warn',
+            message:
+              `${n} timeline projection(s) point to soft-deleted event pages ` +
+              '(hidden at read time; clean up with `gbrain integrity auto`).',
+          },
+    );
+  } catch {
+    checks.push({ name: 'chronicle_projection_health', status: 'ok', message: 'no event projections yet' });
+  }
+
   // 3. Brain score
   try {
     const health = await engine.getHealth();

test/chronicle-doctor.test.ts

@@ -0,0 +1,38 @@
+/**
+ * v0.42.x — Life Chronicle (#2390) doctor chronicle_projection_health (Phase B.13).
+ * Verifies the orphan-detection query the doctor check runs: a timeline
+ * projection whose event page is soft-deleted is counted (hidden at read time,
+ * flagged for cleanup).
+ */
+import { describe, test, expect, beforeAll, afterAll } from 'bun:test';
+import { PGLiteEngine } from '../src/core/pglite-engine.ts';
+import { runChronicleExtract, type ChronicleJudge } from '../src/core/chronicle/extract-events.ts';
+
+let engine: PGLiteEngine;
+
+const orphanQuery = `SELECT count(*)::int AS n FROM timeline_entries te
+   JOIN pages ep ON ep.id = te.event_page_id
+   WHERE te.event_page_id IS NOT NULL AND ep.deleted_at IS NOT NULL`;
+
+beforeAll(async () => {
+  engine = new PGLiteEngine();
+  await engine.connect({ database_url: '' });
+  await engine.initSchema();
+});
+afterAll(async () => { await engine.disconnect(); });
+
+describe('chronicle_projection_health detection', () => {
+  test('counts projections whose event page is soft-deleted; zero otherwise', async () => {
+    await engine.putPage('meetings/d', { type: 'meeting', title: 'd', compiled_truth: 'x'.repeat(120), effective_date: new Date('2026-06-18T12:00:00Z') });
+    const judge: ChronicleJudge = async () => ({ events: [{ when: '2026-06-18T12:00:00Z', who: [], what: 'an event', kind: 'meeting' }] });
+    await runChronicleExtract(engine, { slug: 'meetings/d', judge });
+
+    let r = await engine.executeRaw<{ n: number }>(orphanQuery);
+    expect(Number(r[0].n)).toBe(0); // healthy: event page live
+
+    // Soft-delete the event page → its projection becomes an orphan.
+    await engine.executeRaw(`UPDATE pages SET deleted_at = now() WHERE type = 'event'`);
+    r = await engine.executeRaw<{ n: number }>(orphanQuery);
+    expect(Number(r[0].n)).toBe(1);
+  });
+});