docs(ai): list all three embeddable clauses in int-spec header; drop tautological assert (F14,F15)

F14: the lockstep int-spec header still described the pre-F6 two-clause set with
     'iff' — add the content-JSON text-node clause so it matches embeddablePredicate.
F15: remove the redundant expect(ttl).toBeLessThanOrEqual(120) that followed
     expect(ttl).toBe(120).

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

apps/server/src/integrations/ai/ai-settings.service.spec.ts

@@ -186,7 +186,6 @@ describe('AiSettingsService.reindex progress seed', () => {
     // pinned to the client poll cap (120s) so a still-pending run can't expire
     // into a false "done" while the client is still polling (F11).
     expect(ttl).toBe(120);
-    expect(ttl).toBeLessThanOrEqual(120);
     expect(aiQueue.add).toHaveBeenCalledTimes(1);
     // Seed must precede the enqueue so the first poll already reports done=0.
     expect(order).toEqual(['start', 'add']);

apps/server/test/integration/page-embeddable-ids-lockstep.int-spec.ts

@@ -11,10 +11,11 @@ import { getTestDb, destroyTestDb, createWorkspace, createSpace } from './db';
  * ID set while the status endpoint reports the count as the live denominator, so
  * if the two predicates ever diverge the "done X of Y" counter ends on the wrong
  * total. Both share the SAME WHERE: a page qualifies iff it is non-deleted AND
- * (text_content has a non-whitespace char OR it has a non-deleted embedding row).
+ * (text_content has a non-whitespace char OR — when text_content is empty — its
+ * content JSON has a text node OR it has a non-deleted embedding row).
  *
  * This is a DB-level invariant: the predicate lives in raw SQL (`text_content ~
- * '[^[:space:]]'`) and an EXISTS subquery, so a unit test with mocked Kysely
+ * '[^[:space:]]'`, `content::text ~ '"type":"text"'`) and an EXISTS subquery, so a unit test with mocked Kysely
  * cannot observe it. We seed every boundary case against real Postgres and
  * assert the returned ID set EQUALS the count (and is exactly the expected set).
  * A future edit that touches one predicate but not the other turns this red.