Removes real wall-clock waits and per-test rebuilds from the slowest
test files, replacing them with deterministic seams. **No assertions
weakened, no timeouts widened, no retries added** — this is anti-pattern
removal per FN-5048, verified by re-running each file.
## Changes
| File | What | Result |
|---|---|---|
| `dashboard/.../insights-routes.test.ts` | Boot server+store **once**
in `beforeAll` (was `createServer` + `TaskStore.init` per test ×24);
reset insight tables per test for isolation; drive sweeper via fake
timers | test-exec **~3.7s → ~0.8s** |
| `core/.../db.test.ts` | Fixed 150ms write-lock hold → manual stdin
signal-release (keeps the real OS-lock contention under test); fixed a
real EPIPE on redundant release | 152 pass, non-flaky / 8 runs; −300ms
dead wait |
| `core/.../mission-store.test.ts` | 4 real `setTimeout` sleeps (only
there to force distinct timestamps) → `vi.setSystemTime` controlled
clock | anti-pattern removed |
| `core/.../agent-store.test.ts` | 1 real ordering-sleep → injected
`renewedAt` clock; **assertions strengthened** to pin exact timestamp
values | anti-pattern removed |
| `engine/.../in-process-runtime.test.ts` | Fake the one real 25ms
sleep; drop its inflated 30s per-test timeout | anti-pattern removed |
## Honest accounting
- The **real wins** are `insights-routes` (per-test server boot
eliminated, ~75% execution-time cut) and `db` (dead lock-hold removed).
- The **timestamp-sleep removals** (mission-store, agent-store,
in-process-runtime) are small absolute wins — the headline per-file
durations (16–25s) were **full-suite shard contention, not in-file dead
time** (each runs in 3–10s isolated). But they eliminate the FN-5048
real-wait anti-pattern, so a hub edit no longer drags real sleeps into
every `--changed` selection.
- **`workflow-routes.test.ts` was evaluated for splitting and
deliberately NOT split.** A measured A/B showed the 4-way split
*regressed* wall-clock (6s → 11s): the file is import/transform-bound
(per-file esbuild + `@fusion/core`/express import ≈ 5s > the ~4.3s test
runtime), and per-test store migration was already amortized by
`installInMemoryDbSnapshot`. Splitting only multiplies the dominant
fixed cost. Left intact.
## Verification
- `core` 612/612, `dashboard` 24/24, `engine` 78/78 (file-scoped).
- `tsc --noEmit` clean on all 3 packages; eslint clean.
Follow-up (not in this PR): `scripts/test-timings.json` is stale (its
former #1 file no longer exists) — refresh via `pnpm test:velocity --
--measure --write-report` so the watchdog budgets and velocity report
reflect reality.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
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## Summary by CodeRabbit
* **Tests**
* Made several test suites more deterministic by replacing real-time
delays with controlled timers and fixed timestamps.
* Improved lock and task checkout tests to use manual release signals,
reducing timing-related flakiness.
* Streamlined route test setup/teardown for faster, more reliable runs.
* Added safer cleanup around timer-based tests to avoid intermittent
failures.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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