chore(release): prepare 0.3.5

[yui-stingray]

Summary

• Prepare package metadata, release notes, public documentation, and sample evidence for yui-agent-guard 0.3.5.
• Record the bounded context-regex availability fix and content-bound audit-event verification already present on master.
• Include the evidence compatibility correction merged in PR Restore v1 evidence compatibility and isolate bound-event v2 #44: legacy v1 reports remain consumable, while v2 requires a bound audit artifact and exact report/manifest version pairing.
• Keep the copyable GitHub Action example pinned to the immutable v0.3.4 release commit; refresh it only after a future 0.3.5 publication.

Validation

• The current PR head is synchronized with master.
• CI passes on Python 3.11.4, 3.12, 3.13, and 3.14, including packaged Action smoke tests, Windows CLI checks, actionlint, and the release toolchain contract.
• A clean local wheel contract passed.
• An independent merge review found no findings.

Boundary

This is release preparation only. It does not tag, publish, submit to Marketplace, or claim maintainer approval. v0.3.5 is not tagged, released on GitHub, or published to PyPI.

The demand-validation freeze remains in force through 2026-09-20, with review on 2026-09-21. This PR may be reviewed as preparation, but it does not lift the freeze or authorize merge, tagging, or publication. Merge and tag remain gated on explicit maintainer approval and completion of all release criteria.

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Review details

⚙️ Run configuration

Configuration used: Repository YAML (base), Organization UI (inherited)

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Run ID: 9bfc350c-d741-47fc-a291-8fe861fb4542

📥 Commits

Reviewing files that changed from the base of the PR and between 41d08b5 and efd2bb4.

📒 Files selected for processing (9)

• CHANGELOG.md
• README.md
• docs/evidence-consumer-contracts.md
• docs/evidence-samples/agent-guard-report.json
• docs/quickstart-existing-repo.md
• pyproject.toml
• src/agent_guard/__init__.py
• tests/test_contract_stability.py
• tests/test_workflow_release_contract.py

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[yui-stingray]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Hooray!

Reviewed commit: efd2bb4006

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