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This PR documents the release notes writing process in detail and adds a guard check to `release_checklist.py` to ensure release notes are created for `-rc1` releases before proceeding with downstream repository updates. - **doc/dev/release_checklist.md**: Expanded "Writing the release notes" section with detailed steps for generating, reviewing, and formatting release notes in Verso format - **script/release_checklist.py**: Added `check_release_notes_file_exists()` to verify the release notes file exists in reference-manual repository - **.claude/commands/release.md**: Added "Release Notes" section explaining the process for creating release notes during `-rc1` releases 🤖 Prepared with Claude Code Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>