ci: enforce conventional pull request titles

[mldangelo-oai]

Summary

• Validate public pull request titles using the SHA-pinned semantic pull request action.
• Run on opened, edited, reopened, and synchronized PRs with read-only pull request permissions and no checkout of PR-controlled code.
• Preserve Codex Security's supported release: titles alongside standard Conventional Commit types.
• Keep the canonical workflow and Copyberry projection in sync in https://github.com/openai/openai/pull/1262937.

Validation

• Parsed the workflow and verified the read-only permissions, SHA pin, supported triggers, and release: titles.
• Confirmed this file exactly matches the canonical monorepo workflow.
• Ran Prettier and validated the upstream Copyberry projection contract.

[mldangelo-oai]

@codex review

[chatgpt-codex-connector]

Security review completed. No security issues were found in this pull request.

Reviewed commit: dda7be54b9

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[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Hooray!

Reviewed commit: dda7be54b9

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