docs: preserve release branch ancestry

[wauputr4]

Summary

• require merge commits for main to release promotion PRs
• keep main in the production branch history
• prevent future rebase-induced branch divergence

Validation

• git diff --check

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 480796bd-0b47-468c-9711-80547b741661

📥 Commits

Reviewing files that changed from the base of the PR and between 7b805f8 and 88e3eda.

📒 Files selected for processing (1)

• CONTRIBUTING.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/keep-release-history-aligned

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[gemini-code-assist]

Code Review

This pull request updates the CONTRIBUTING.md file to clarify that production promotion pull requests should be merged using a merge commit to ensure the main branch remains in the release history. There are no review comments, and the changes look appropriate.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	indopensource-org	88e3eda	Commit Preview URL Branch Preview URL	Jul 20 2026, 09:25 AM