Include project rules in commit message generation (#44921)

Closes #38027

Release Notes:

- AI-generated commit messages now respect rules files (e.g.
`AGENTS.md`) if present

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Co-authored-by: Claude Haiku 4.5 <noreply@anthropic.com>
c7d248329bRichard Feldman committed on 12/16/2025, 2:57:19 AM· committed by GitHubparentb17b097
5 files changedLine totals unavailable