get better commit messages from agents

Author: Byron

AGENTS.md

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+# Commit messages
+
+Every commit must have a descriptive title and a substantive body. Title-only
+commit messages are not acceptable.
+
+The body must explain the problem or motivation, what changed, and why the
+chosen approach addresses it. Include relevant behavior before and after the
+change, design decisions, limitations, and validation results. Scale the detail
+to the change; do not add boilerplate or claim checks that were not run.
+
+Commit messages must stand on their own. Put the information needed to understand
+and review the change in the commit body, even when it also appears in a pull
+request description. PR and issue links may provide additional context, but must
+not substitute for that explanation.