chore(main): release cachekit-core 0.5.0

[cachekit-release-bot]

🤖 I have created a release beep boop

0.5.0 (2026-08-07)

⚠ BREAKING CHANGES

• public items EncryptionHeader, KeyRotationState, RotationAwareHeader, and ZeroKnowledgeEncryptor::rotate_key() are removed (EncryptionError::NotImplemented variant included). Use Keyring for master-key rotation.

Features

• replace dead key-rotation machinery with keyring decrypt helper (LAB-683) (#67) (327f993)

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[cachekit-release-bot]

🤖 Created releases:

• cachekit-core-v0.5.0

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