security: SHA-pin all GitHub Actions

[hummbl-dev]

Summary

SHA-pins all GitHub Actions references in this repo to prevent supply-chain attacks via tag re-pointing.

Actions pinned: 9
Workflows updated: 4

Each mutable tag reference (e.g., @v4) has been replaced with a SHA-pinned reference (e.g., @<40-char-sha> # v4). The original tag is preserved as a comment for readability and update tracking.

Why

Mutable tags can be re-pointed by maintainers to any commit, including malicious ones. SHA-pinning ensures the exact code that was reviewed is what runs. This is a P2 mitigation from the runner fleet wargame (2026-07-23).

Recommendation

Consider adding Renovate or Dependabot for automated SHA updates with review gates, so pinning doesn't create a maintenance burden.

Generated with Devin

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: 81e47379-42fd-4cf1-a53e-cefe6c415116

📥 Commits

Reviewing files that changed from the base of the PR and between 412c8f9 and f45c78a.

📒 Files selected for processing (4)

• .github/workflows/base120.yml
• .github/workflows/ci.yml
• .github/workflows/guardrails.yml
• .github/workflows/mirror-conformance.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch security/sha-pin-actions

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