🔧 chore(ci): switch validate-title to zendev v0.0.5

[zrr1999]

Summary

• switch the CI validate-title integration to zendev v0.0.5

Validation

• compared branch against origin/main
• no additional local checks were run in this body-only update

Notes

• adds the missing template section so the PR body headings match repository policy

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Pin third-party action to immutable commit SHA

This change replaces an immutable SHA-pinned action with a mutable tag (@v0.0.5), which weakens CI supply-chain integrity and reproducibility because the tag can be retargeted without changes in this repository. In .github/workflows/ci-pr-checks.yml, keeping third-party uses: entries pinned to a commit SHA avoids unexpected behavior or malicious code execution if the upstream tag is moved.

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