chore(governance): add governance gates

[chitcommit]

Adds SHA-pinned Governance workflow calling CHITTYFOUNDATION/chittycanon and enables Portfolio Hardening.\n\n- Required for CF Workers Builds portfolios.\n- Enforces CODEOWNERS + hardening gates.\n- Governance SHA: 83a7d1da1cfa5041f18450a6d43ff336068285de

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 37106bca-b224-44e5-add4-adbff7a7edf9

📥 Commits

Reviewing files that changed from the base of the PR and between 946242a and 904b7ba.

📒 Files selected for processing (1)

• .github/workflows/governance.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/governance-bootstrap-83a7d1d-20260417

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