chore(main): release 0.9.0

[cachekit-release-bot]

🤖 I have created a release beep boop

0.9.0 (2026-06-11)

Features

• drop Python 3.9 support, require >=3.10 (#148) (1bb9953)
• honor user serializer under encryption via cross_sdk_compatible marker (#153) (2ad219d), closes #134
• support explicit per-function encryption opt-out (tri-state) (#151) (bf86c43)

Bug Fixes

• bound memory for large DataFrame/Arrow caching (was OOMing at real sizes) (#152) (ccd32c5)
• evict poisoned L2 entry on corruption at the read API (#177) (3a538fa), closes #159
• handle pandas nullable/extension dtypes in no-pyarrow DataFrame fallback (#176) (4de3608)
• harden cache-envelope framing and compression config resolution (#172) (d079f79)
• reject non-finite (NaN/inf) TTL to prevent immortal cache entries (#174) (d90958c)
• stop legacy RedisBackend corrupting binary payloads (#173) (82d0417)

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[cachekit-release-bot]

🤖 Created releases:

• v0.9.0

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