chore(main): release 6.4.0

[aao-ipr-bot]

🤖 I have created a release beep boop

6.4.0 (2026-06-20)

Features

• server/auth: allow_unauthenticated for network-trust deployments (f41764e)

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[bokelley]

Release Please generated v6.4.0 from #957.

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🤖 Created releases:

• v6.4.0

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