Adds an opt-in `inMemory` flag to `Database`/`ArchiveDatabase` (and
`{ inMemoryDb }` to TaskStore, AgentStore, RoutineStore,
AutomationStore, PluginStore) that swaps the on-disk fusion.db /
archive.db for SQLite's `:memory:` connection. Production callers
never set the flag, so behavior is unchanged.
Test files for each store now flip the flag in `beforeEach`. The
handful of tests that exercise cross-instance persistence (open store
A, close, open store B on same dir, expect data) construct disk-backed
stores explicitly inside the test body, marked with a comment at each
site.
Wall-clock impact:
- core: 69.4s → 18.5s (3.7× faster, 3038 tests)
- dashboard: 156.6s → 30.0s (5.2× faster — improvement ripples through
any test that constructs a TaskStore)
The refactor eliminates the per-test SQLite open + WAL fsync + tmp
dir cleanup loop that dominated setup cost: ~50ms/test → ~5ms/test.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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