chore: add mandatory clean-tree and commit-push workflow

AGENTS.md

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+# AGENTS.md
+
+## Mandatory Git Workflow
+
+Before making any code or file change that results in a diff:
+- Ensure `git status --porcelain` is empty.
+- If there are open changes, stop and ask the user how to proceed.
+
+After completing a requested change:
+- Create a commit with a clear message.
+- Push the commit to the current remote branch.
+
+## Scope
+
+These rules apply to all tasks in this repository unless the user explicitly requests a different workflow.