Add autonomous attested release workflow

[zackees]

Summary

• Adds .github/workflows/release-auto.yml, modeled on zackees/soldr's attested release workflow.
• Gates releases on a new workspace/PyPI version, builds native artifacts through the existing reusable native build workflow, and packages GitHub Release archives.
• Attests GitHub Release archive checksums with actions/attest-build-provenance@v3.
• Builds fbuild's custom PyPI wheels from the native artifacts and publishes with pypa/gh-action-pypi-publish@release/v1 using Trusted Publishing with attestations: true.
• Documents the release flow and required PyPI Trusted Publisher setup.

Validation

• git diff --check
• Parsed all workflow YAML files with PyYAML
• python -m py_compile ci/publish.py
• Imported ci.publish and confirmed project metadata/artifact map load

Fixes #166

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 03f2f8f6-dc8d-4fb2-8f22-d1d7beae67bb

📥 Commits

Reviewing files that changed from the base of the PR and between 83bb2ed and 16550c0.

📒 Files selected for processing (2)

• .github/workflows/README.md
• .github/workflows/release-auto.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-native-build-attestations

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