Gap 1 (auditor deep review): `GET /api/memory` was computing hitRate from
memoryCache.stats() but never exposing cacheStats in the response. MemoriesTab
reads `stats.cacheStats` to decide whether to render the Hit Rate card (only
when hits + misses > 0). Without this field the card never appeared even when
hitRate > 0, contradicting plan 21 §7 #6 and bug-fix #5.
Gap 2 (auditor deep review): 8 `tests/unit/ui/*.test.tsx` files created by F7
were orphaned — `test:unit` filters `*.test.ts` only, and `vitest.mcp.config.ts`
does not include `tests/unit/ui/`. Added `test:vitest:ui` script using the
default vitest.config.ts (which already includes `tests/unit/**/*.test.tsx`).
Coverage gate aligned with the effective 40/40/40/40 per user decision.
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