Add AGENTS.md with commit and push rules

AGENTS.md

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+# Agent Guidelines
+
+## Git Workflow
+
+- **Commit frequently**: After completing a meaningful unit of work (feature, fix, or file update), stage changes with `git add` and create a commit with a clear, concise message in the imperative mood (e.g., "Add parser", "Fix timeout").
+- **Push to remote**: Once the local commit(s) are ready, push them to the remote repository. Use `git push -u origin main` if the upstream branch is not yet tracked; otherwise use `git push`.
+- **No uncommitted changes left behind**: Before finishing a task, ensure all intended changes are committed and pushed to avoid losing work.
+- **No empty commits**: Avoid creating empty or placeholder commits.