chore: pin external GitHub Actions to commit SHAs

[joel-phantom]

Summary

• Pin all unpinned external GitHub Action uses: references to full 40-character commit SHAs
• Original version tags/branches preserved as inline comments for maintainability
• No other CI changes included

Motivation

Supply chain security hardening: pinning actions to immutable commit SHAs prevents silent changes from compromised or force-pushed tags.

Part of the org-wide audit tracked in SEC-6683 and SEC-7928.

Test plan

• CI passes on this branch
• Verify pinned SHAs match the expected versions

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 798c507b-d00b-4938-8af1-b6567296000a

📥 Commits

Reviewing files that changed from the base of the PR and between f0e8ff9 and 9569a52.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• .github/workflows/pages.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch autopilot/sec-7928-patch-remaining-repos-with-unpinned-github-actions-from-sec

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