FN-8270: restore PostgreSQL migration quarantine tests

Restore seven PostgreSQL-compatible engine suites to the active test runs.

- Model asynchronous insight and goal-store collaborators in reporter and diagnostics tests.
- Await PostgreSQL audit reads in merger reliability tests.
- Remove the restored suites from Vitest exclusions and the quarantine ledger.

Files changed:
 .../__tests__/backlog-pressure-reporter.test.ts    | 19 +++++++----
 .../dependency-blocked-todo-reporter.test.ts       | 15 ++++++---
 .../goal-injection-diagnostics-wiring.test.ts      | 15 ++++++---
 .../__tests__/merger-cwd-fallback-removed.test.ts  | 13 +++++---
 .../integration-worktree-state.test.ts             | 13 +++++---
 .../merge-runner-spawn-enoent-prevention.test.ts   | 15 +++++---
 .../meta-chain-auto-close.test.ts                  |  9 ++++--
 packages/engine/vitest.config.ts                   | 20 ++----------
 scripts/lib/test-quarantine.json                   | 37 +---------------------
 9 files changed, 73 insertions(+), 83 deletions(-)

Fusion-Task-Id: FN-8270
Fusion-Task-Lineage: 65be82ef-f4d4-4a8a-b3cc-63486ee0823a
Co-authored-by: Fusion (runfusion.ai) <noreply@runfusion.ai>

scripts/lib/test-quarantine.json

@@ -1,41 +1,6 @@
 {
-  "$comment": "Flaky-test quarantine ledger (deletion ratchet \u2014 see AGENTS.md 'Flaky tests: quarantine on sight' and docs/testing.md 'Quarantine ledger and the deletion ratchet'). A test observed failing without a corresponding real bug is quarantined ON SIGHT: add an entry here AND a matching one-line `exclude` entry in that package's vitest config, in the same commit. Every entry needs a non-empty `reason` (link the failing run) and a `quarantinedAt` date \u2014 the entry expires 14 days later, at which point the test file is DELETED unless someone rescues it with evidence it catches real regressions plus a root-cause fix (never appeasement). There is deliberately no loader module and no automation around this file: it is a dated record, the vitest config is the enforcement.",
+  "$comment": "Flaky-test quarantine ledger (deletion ratchet — see AGENTS.md 'Flaky tests: quarantine on sight' and docs/testing.md 'Quarantine ledger and the deletion ratchet'). A test observed failing without a corresponding real bug is quarantined ON SIGHT: add an entry here AND a matching one-line `exclude` entry in that package's vitest config, in the same commit. Every entry needs a non-empty `reason` (link the failing run) and a `quarantinedAt` date — the entry expires 14 days later, at which point the test file is DELETED unless someone rescues it with evidence it catches real regressions plus a root-cause fix (never appeasement). There is deliberately no loader module and no automation around this file: it is a dated record, the vitest config is the enforcement.",
   "entries": [
-    {
-      "file": "packages/engine/src/__tests__/backlog-pressure-reporter.test.ts",
-      "reason": "VAL-REMOVAL-005 PG migration: fails due to SQLite removal or sync API incompatibility in backend mode. Failing run: https://github.com/Runfusion/Fusion/actions/runs/29344576232. Mirrored in packages/engine/vitest.config.ts.",
-      "quarantinedAt": "2026-07-14"
-    },
-    {
-      "file": "packages/engine/src/__tests__/dependency-blocked-todo-reporter.test.ts",
-      "reason": "VAL-REMOVAL-005 PG migration: fails due to SQLite removal or sync API incompatibility in backend mode. Failing run: https://github.com/Runfusion/Fusion/actions/runs/29344576232. Mirrored in packages/engine/vitest.config.ts.",
-      "quarantinedAt": "2026-07-14"
-    },
-    {
-      "file": "packages/engine/src/__tests__/goal-injection-diagnostics-wiring.test.ts",
-      "reason": "VAL-REMOVAL-005 PG migration: fails due to SQLite removal or sync API incompatibility in backend mode. Failing run: https://github.com/Runfusion/Fusion/actions/runs/29344576232. Mirrored in packages/engine/vitest.config.ts.",
-      "quarantinedAt": "2026-07-14"
-    },
-    {
-      "file": "packages/engine/src/__tests__/merger-cwd-fallback-removed.test.ts",
-      "reason": "VAL-REMOVAL-005 PG migration: fails due to SQLite removal or sync API incompatibility in backend mode. Failing run: https://github.com/Runfusion/Fusion/actions/runs/29344576232. Mirrored in packages/engine/vitest.config.ts.",
-      "quarantinedAt": "2026-07-14"
-    },
-    {
-      "file": "packages/engine/src/__tests__/reliability-interactions/integration-worktree-state.test.ts",
-      "reason": "VAL-REMOVAL-005 PG migration: reliability fixture uses PG-backed store but sync APIs (getRunAuditEvents, getDatabase) fail in backend mode. Failing run: https://github.com/Runfusion/Fusion/actions/runs/29344576232. Mirrored in packages/engine/vitest.config.ts.",
-      "quarantinedAt": "2026-07-14"
-    },
-    {
-      "file": "packages/engine/src/__tests__/reliability-interactions/merge-runner-spawn-enoent-prevention.test.ts",
-      "reason": "VAL-REMOVAL-005 PG migration: reliability fixture uses PG-backed store but sync APIs (getRunAuditEvents, getDatabase) fail in backend mode. Failing run: https://github.com/Runfusion/Fusion/actions/runs/29344576232. Mirrored in packages/engine/vitest.config.ts.",
-      "quarantinedAt": "2026-07-14"
-    },
-    {
-      "file": "packages/engine/src/__tests__/reliability-interactions/meta-chain-auto-close.test.ts",
-      "reason": "VAL-REMOVAL-005 PG migration: reliability fixture uses PG-backed store but sync APIs (getRunAuditEvents, getDatabase) fail in backend mode. Failing run: https://github.com/Runfusion/Fusion/actions/runs/29344576232. Mirrored in packages/engine/vitest.config.ts.",
-      "quarantinedAt": "2026-07-14"
-    },
     {
       "file": "packages/engine/src/__tests__/heartbeat-error-recovery.test.ts",
       "reason": "Full-suite shard 1 timeout (30s) on rotation-shaped 401 recovery under load without product bug evidence. Failing run: https://github.com/Runfusion/Fusion/actions/runs/29636550951. Mirrored in packages/engine/vitest.config.ts.",