Notes for coding agents

Read CONTRIBUTING.md before changing anything. Every rule in it applies to agents.

@CONTRIBUTING.md

Before each commit:
1. Stage exactly what you mean to commit (no git commit -a).
2. Print the scope with python3 scripts/check_text_hygiene.py scope.
3. Write the message as UTF-8 without a byte-order mark, to a file outside the repository.
4. Check it with python3 scripts/check_text_hygiene.py message <file>.
5. Commit with git commit -F <file> once the check passes.
On Windows, run python instead of python3.
Do not copy the format of older commits. Much of the history before October 2026 breaks these rules.
When you brief a sub-agent, give it the exact commit format and these rules, not a paraphrase.
Keep working papers (briefs, reviews, scratch measurements, logs) outside the repository.
Add no Co-Authored-By or other trailers.