docs: add CODE_OF_CONDUCT.md

[mrbrandao]

Summary

• Add CODE_OF_CONDUCT.md referencing the Contributor Covenant v2.1 and pointing to GOVERNANCE.md for enforcement details
• Link CODE_OF_CONDUCT.md from README.md

Related Issues

Part of AAIF readiness work. Required for GitHub community standards checklist and OpenSSF Best Practices Badge.

Test Plan

• CODE_OF_CONDUCT.md is present at repo root
• README.md links to CODE_OF_CONDUCT.md
• GitHub community standards checklist shows Code of Conduct as complete

Checklist

• Tests pass (pytest)
• Linting passes (ruff check src tests)
• Type checking passes (ty check)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 86bd2b91-9a10-43cc-99b8-7f23f986887e

📥 Commits

Reviewing files that changed from the base of the PR and between de87f1c and e9c451a.

📒 Files selected for processing (2)

• CODE_OF_CONDUCT.md
• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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