chore(main): release cachekit 0.2.0

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0.2.0 (2026-09-28)

⚠ BREAKING CHANGES

• encryption: a secure cache created without a tenantId now binds tenant "default" into the AES-GCM AAD instead of "". That is the value HKDF already derived its key from and the value the protocol requires, so a tenant-less cachekit-ts secure cache now shares ciphertext with cachekit-py and cachekit-rs on tenant "default". Caches with an explicit tenantId are unaffected. Entries written by a tenant-less secure cache on @cachekit-io/cachekit 0.1.5 or earlier no longer authenticate, so every read of one fails decryption. To migrate, delete those entries (or switch to a fresh namespace or key prefix) once no pre-upgrade instance is still writing; during a rolling upgrade, old and new instances cannot read each other's entries. Do not wait out the TTL instead. Under the secure preset's default reliability settings, each undecryptable read is retried and counted as a circuit-breaker failure, so five within a minute open the breaker, and while it is open every read misses and every write is dropped, for all keys.
• cache: secure.wrap() fails closed when encryption is not configured (LAB-513) (#123)

Features

• encryption: previousMasterKeys keyring rotation surface (LAB-685) (#103) (e7d1a8f)
• encryption: surface hardware-acceleration detection (LAB-523) (#132) (0ae83ba)

Bug Fixes

• cachekitio: reject reserved cache-key segments in request path (CWE-22, LAB-2877) (#118) (c93083b)
• cachekitio: send X-CacheKit-TTL and reject invalid TTLs per protocol spec (LAB-239) (#110) (0862629)
• cache: secure.wrap() fails closed when encryption is not configured (LAB-513) (#123) (87dee26)
• cache: serialize set() values before the reliability executor (LAB-5139) (#136) (4d44605)
• encryption: resolve tenant_id once for HKDF and AAD (LAB-4668) (#133) (8bb5269)
• interop: fire map/object collection cap before key materialisation (LAB-413) (#113) (403b1b3)
• invalidation: deserializeEvent fails closed with SerializationError on every malformed payload (LAB-3477) (#126) (059ccc6)
• L1 TTL cap, loud size rejections, Node-free workers types (LAB-1388) (#98) (13a3345)
• reliability: don't retry or count permanent backend errors toward the breaker (LAB-5215) (#139) (49f0954)
• security: store ciphertext in L1 for encrypted caches (LAB-238) (#104) (0b1b2f8)
• serialization: bound msgpack decode at all untrusted call sites (LAB-281) (#111) (19ad90c)
• serialization: bound msgpack decode nesting depth before allocation (LAB-2487) (#112) (906942d)
• serialization: cache Uint8Array values as msgpack bin; binary key args hash by bytes (LAB-4839) (#134) (be40638)
• workers: keep compression on by default for the Cache API backend (LAB-5126) (#137) (ada34a8)

---

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