chore: release 0.1.0-beta.21

[ScriptedAlchemy]

Summary

• release the repository-identity authority fix as 0.1.0-beta.21
• keep the release diff to the canonical six metadata files

Verification

• scripts/check-release-pr-integrity.sh HEAD^ HEAD
• cargo metadata --locked --no-deps --format-version 1
• manifest, Cargo, server, and version files agree on 0.1.0-beta.21
• git diff --check

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Latest commit: 69ad6df

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