chore(meta): file T-1243 — fog perf test flakes under gate load

The pre-push gate rejected the T-1213 push on a wall-clock fog budget (0.606 vs 0.5 ms) that passes 23/23 in isolation on the same build. Second hardening cycle for the same failure mode: min-of-7 defends against one slow sample, not the sustained core saturation the gate itself creates by running cargo and tooling suites immediately before it.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

.pql/changelog/ticket_idmap/2026-08.sql

@@ -2,3 +2,4 @@ INSERT INTO ticket_idmap (record_id, ticket_id, created_at, updated_at, deleted_
 INSERT INTO ticket_idmap (record_id, ticket_id, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06FXRSY7QWD8J5X6G1N86WMKEC', 'T-1240', '2026-08-07 13:26:56.708', '2026-08-07 13:26:56.708', NULL, 'dc79a976524b951a73f05532772ef86a', 2) ON CONFLICT(record_id) DO UPDATE SET ticket_id=excluded.ticket_id, updated_at=excluded.updated_at, deleted_at=excluded.deleted_at, hash=excluded.hash, canonical_version=excluded.canonical_version WHERE excluded.updated_at >= ticket_idmap.updated_at;
 INSERT INTO ticket_idmap (record_id, ticket_id, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06G0495WRHF8ADK82VR8CH1J8R', 'T-1241', '2026-08-14 21:19:17.192', '2026-08-14 21:19:17.192', NULL, '0374016de542b027720ca7a45d39f385', 2) ON CONFLICT(record_id) DO UPDATE SET ticket_id=excluded.ticket_id, updated_at=excluded.updated_at, deleted_at=excluded.deleted_at, hash=excluded.hash, canonical_version=excluded.canonical_version WHERE excluded.updated_at >= ticket_idmap.updated_at;
 INSERT INTO ticket_idmap (record_id, ticket_id, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06G04975H3S7GRVQXHKYCR7BKR', 'T-1242', '2026-08-14 21:19:27.624', '2026-08-14 21:19:27.624', NULL, '410d294a5da4ba7435bc3fd4d1e08c95', 2) ON CONFLICT(record_id) DO UPDATE SET ticket_id=excluded.ticket_id, updated_at=excluded.updated_at, deleted_at=excluded.deleted_at, hash=excluded.hash, canonical_version=excluded.canonical_version WHERE excluded.updated_at >= ticket_idmap.updated_at;
+INSERT INTO ticket_idmap (record_id, ticket_id, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06G0P0F9C3RKKK23ZHHTANCPZW', 'T-1243', '2026-08-16 14:37:49.794', '2026-08-16 14:37:49.794', NULL, '0dbba61f1c75851f6e0cca78402da745', 2) ON CONFLICT(record_id) DO UPDATE SET ticket_id=excluded.ticket_id, updated_at=excluded.updated_at, deleted_at=excluded.deleted_at, hash=excluded.hash, canonical_version=excluded.canonical_version WHERE excluded.updated_at >= ticket_idmap.updated_at;

.pql/changelog/tickets/2026-08.sql

@@ -610,3 +610,4 @@ was missing, because each asserted a field it already knew about and none
 asserted the SET. There is now a test that walks all eight dense planes of
 EncodedStepCanvas and fails if any is absent from the decode — verified by
 disabling the fix and watching it fail by name.', 'in_progress', 'high', NULL, NULL, 'D-258', '2026-07-26 21:54:15.245', '2026-08-16 13:05:35.162', NULL, 'e611e465ff1fd8de7b71b3de10702fec', 2) ON CONFLICT(record_id) DO UPDATE SET type=excluded.type, parent_record_id=excluded.parent_record_id, title=excluded.title, description=excluded.description, status=excluded.status, priority=excluded.priority, assigned_to=excluded.assigned_to, team=excluded.team, decision_ref=excluded.decision_ref, updated_at=excluded.updated_at, deleted_at=excluded.deleted_at, hash=excluded.hash, canonical_version=excluded.canonical_version WHERE excluded.updated_at >= tickets.updated_at;
+INSERT INTO tickets (record_id, type, parent_record_id, title, description, status, priority, assigned_to, team, decision_ref, created_at, updated_at, deleted_at, hash, canonical_version) VALUES ('06G0P0F9C3RKKK23ZHHTANCPZW', 'bug', '06FBPPMZNNEV052DBYYY3A897C', 'test_visibility_texture_update_performance flakes under gate load — min-of-7 was not enough', 'Wall-clock perf assertion in client/tests/test_fog_shader.gd:213 (best-of-7 < 0.5 ms, D-059 budget) failed the pre-push gate on 2026-08-16 at 0.606 ms, then passed 23/23 in isolation minutes later on the same build. The failing run was a full-suite pass inside the hook, which runs AFTER the tooling suite and cargo checks, so every one of the seven samples was inflated together by a loaded machine. My manual full-suite run of the identical tree passed 1830/0. Nothing in the pushed change touches the fog path (Atlas protocol decode, colorize, terrain layer, tooling). This is the SECOND recorded hardening cycle for the same failure mode: the estimator is already min-of-7 (T-1210) after median-of-5 flaked three times on 2026-07-26 when a cargo build saturated the cores (0.549/0.503/0.638). Taking the minimum defends against ONE slow sample, not against sustained saturation, which is precisely the condition the gate creates by design. Direction: measure CPU time rather than wall clock (Time.get_ticks_usec measures elapsed, so it prices the scheduler in), or make the budget assertion load-aware, or move the perf assertions out of the correctness gate into a dedicated bench run where the machine is quiet. Do NOT simply raise the 0.5 threshold -- that discards the budget D-059 set without deciding to.', 'backlog', 'medium', NULL, 'client', NULL, '2026-08-16 14:37:49.792', '2026-08-16 14:37:49.792', NULL, '513d27f28c0ff1a50bd36692fb96fa46', 2) ON CONFLICT(record_id) DO UPDATE SET type=excluded.type, parent_record_id=excluded.parent_record_id, title=excluded.title, description=excluded.description, status=excluded.status, priority=excluded.priority, assigned_to=excluded.assigned_to, team=excluded.team, decision_ref=excluded.decision_ref, updated_at=excluded.updated_at, deleted_at=excluded.deleted_at, hash=excluded.hash, canonical_version=excluded.canonical_version WHERE excluded.updated_at >= tickets.updated_at;