Pin GitHub Actions to immutable SHAs

[javier20dev25]

This PR replaces mutable GitHub Action tags with immutable commit SHAs across 8 workflow files.

Affected workflows:

• .github/workflows/claude.yml
• .github/workflows/conformance.yml
• .github/workflows/deploy-docs.yml
• .github/workflows/examples.yml
• .github/workflows/main.yml
• .github/workflows/publish.yml
• .github/workflows/release.yml
• .github/workflows/update-spec-types.yml

No behavioral changes expected. Only immutable SHA pinning and hardening fixes.

---

Prepared with Sentinel after manual review.

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Latest commit: 0ceb10b

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commit: 0ceb10b