chore(governance): add AGENTS.md + CHANGELOG baseline

[yakimoto]

Repo-governance baseline (per wave-foundation frameworks/repo-governance): an agent contract (AGENTS.md) + a Keep-a-Changelog CHANGELOG.md. Inherits the org defaults in wave-av/.github.

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Summary by cubic

Establish repo governance baseline by adding AGENTS.md (agent contract) and CHANGELOG.md (Keep a Changelog scaffold). Inherits org defaults and documents PR rules, commit conventions, and security reporting.

^{Written for commit b6655cb. Summary will update on new commits.}

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Latest commit: b6655cb

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 51294105-cffc-4e47-8744-5b0d613e7e40

📥 Commits

Reviewing files that changed from the base of the PR and between 8579b42 and b6655cb.

📒 Files selected for processing (2)

• AGENTS.md
• CHANGELOG.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/governance-baseline

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch chore/governance-baseline

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