chore(main): release cachekit-core 0.6.0

[cachekit-release-bot]

🤖 I have created a release beep boop

0.6.0 (2026-08-08)

Features

• cache keyring per-tenant derivation at construction via TenantKeyring (LAB-1638) (#71) (d3f0eb0)
• expose winning-key index via decrypt_indexed for rotation drain observability (LAB-1645) (#73) (d834f74)

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[cachekit-release-bot]

🤖 Created releases:

• cachekit-core-v0.6.0

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