ci: pin GitHub Actions refs to commit SHAs

[MTG-Thomas]

Summary

Pin all GitHub Action usages in .github/workflows to commit SHAs and add nearby version comments (e.g., # v4, # v1.8) to reduce workflow supply-chain risk.

Verification

• git diff --check
• git grep -n "uses: .*@v[0-9]" .github/workflows (no floating @v refs remain)
• actionlint .github/workflows/*.yml run where available (context-scan reported shellcheck style warnings in existing script blocks)

Tracking

• Related issue: MTG-Thomas/bifrost-infra#262

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 20ab0c3d-954e-44be-9a58-1b5bce824450

📥 Commits

Reviewing files that changed from the base of the PR and between 8b7b4f0 and 9739105.

📒 Files selected for processing (4)

• .github/workflows/deploy-winget.yml
• .github/workflows/initial-deploy.yml
• .github/workflows/release-msi.yml
• .github/workflows/release.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/pin-github-actions-shas

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