chore(main): release 6.4.1

[aao-ipr-bot]

🤖 I have created a release beep boop

6.4.1 (2026-06-28)

Performance Improvements

• types: defer pydantic core-schema builds to cut import memory (#959) (f418961)

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[bokelley]

Reviewed the Release Please diff: version and manifest bump to 6.4.1 plus changelog entry for #959. CI is fully green, including schema validation.

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🤖 Created releases:

• v6.4.1

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