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chore(release): v3.13.0 — cache layer hardening (per-key isolation + bypass + chunked replay + singleflight) (#67)

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Per release_kit overlay (CLAUDE.md § Iron Rule 5.5):
- package.json bumped 3.12.0 → 3.13.0
- CHANGELOG.md updated with v3.13.0 entry
- README.md § Response Cache updated to document the four hardening features

This is a release preparation commit. Tag push to v3.13.0 will trigger
.github/workflows/release.yml which auto-creates the GitHub Release.

cli.js does not perform proxy-layer response caching, stampede protection,
or replay; this release only ships internal cache-layer correctness and
concurrency improvements that do not change the OpenAI-compatible wire
surface visible to clients. No client-observable wire shape change.

Co-authored-by: dtzp555 <dtzp555@gmail.com>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>
This commit is contained in:
dtzp555-max
2026-05-07 17:19:44 +10:00
committed by GitHub
co-authored by taodeng Claude Opus 4.7
parent 5ff30ac9b6
commit 9494fd6c69
3 changed files with 32 additions and 5 deletions
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CHANGELOG.md
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# Changelog
## v3.13.0 — 2026-05-07
### Features (cache layer hardening)
- **Per-key cache isolation** (D1) — the cache key now includes the API key id, so distinct keys never share cache entries. Anonymous/unauthenticated callers share one `anon` pool. Hash format upgraded to `v2`; legacy v1-format rows orphan and are reaped by the existing TTL cleanup interval (no migration script).
- **`cache_control` bypass** (D2) — when a request carries an Anthropic `cache_control` annotation (top-level or nested in a content array), OCP skips its own cache entirely. The caller is using Anthropic-side prompt caching deliberately, and OCP must not interfere. A `cache_skipped{reason: cache_control_present}` log line is emitted on bypass.
- **Chunked stream replay** (D3) — when a streaming request hits the cache, the cached content is now emitted as multiple SSE chunks (80 codepoints/chunk, codepoint-safe via `Array.from()`) instead of a single large delta. Multibyte characters (CJK / emoji) stay intact.
- **Singleflight stampede protection** (D4) — concurrent identical cache-miss requests now share one upstream `cli.js` spawn instead of spawning N processes. Followers receive byte-identical responses to what the leader returns. All-or-nothing failure semantics: if the leader errors, all followers receive the same error. Streaming-path singleflight is explicitly out of scope (TODO left for follow-up).
### Behavior changes
- `/cache/stats` response now includes additive fields `inflight` and `requesters` (current in-flight singleflight entries and total waiting callers). Existing fields `entries`, `totalHits`, `sizeBytes` are preserved unchanged.
### Governance
- New ADR [`docs/adr/0005-no-multi-provider.md`](docs/adr/0005-no-multi-provider.md): OCP stays single-provider (Anthropic via `cli.js` spawn). Multi-provider gateway refactor explicitly out of scope; cache improvements are explicitly in scope.
- Design spec for this release: [`docs/superpowers/specs/2026-05-07-cache-upgrade-design.md`](docs/superpowers/specs/2026-05-07-cache-upgrade-design.md).
### No new env vars / no public API surface change
This release adds no new env vars or endpoints. All four improvements are internal correctness/concurrency upgrades to the existing `CLAUDE_CACHE_TTL`-gated cache layer. No client-observable wire shape change.
## v3.12.0 — 2026-04-25
### Features