Port of Python's origin-side cache to TypeScript:
- cache/keys.ts: deriveCacheKey with stableStringify for JSON-canonical HMAC
- cache/backend.ts: MemoryCache (same API as Python)
- cache/index.ts: cacheGet, cachePut, cachePurge with AND semantics
Integrated into dispatch.ts:
- handleContextFetch: cache lookup before execution, store after
- handleMutationCall: purge on invalidation
Cross-language pin test proves Python and TypeScript produce identical
HMAC-SHA256 output for the same inputs:
Public: 605a1ca5ad5994e9b765c8d1b330474c2a0d51a7b8fbbdc402f992da7ba902f6
User-scoped: 30fc08eb46ee4ff2cf7d317e97dca90fd616511e0587304416f71dc863338dc2
34 TypeScript tests (9 new), 165 Python tests (1 new pin test).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
