ci(e9): gate dev-to-main release PRs

[gnanirahulnutakki]

Summary

• run the existing full CI workflow for pull requests into main as well as dev
• run the same CI on exact main pushes after release promotion
• lock the trigger contract with a shell test and require release-PR CI in the maintainer guide

Validation

• make ci
• make release-check
• manual red-team review: only branch allowlists changed; jobs, permissions, pins, concurrency, and dev coverage are unchanged
• security queues: Dependabot 0, code scanning 0, secret scanning 0

Review note

CodeRabbit reached analysis but returned no verdict in its bounded attempt; that is not treated as approval.

Closes #157
Refs #156, #27

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch gnanirahulnutakki/ci/release-pr-gate

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