# M05-L05 exercise — Challenge: build the constraints skill

Starting checkpoint: CP04. Figures: SS11-02, SS11-03, SS11-05, D10.

Submit final SKILL.md, the focused reference, any bounded AGENTS.md correction, four actual case records, and a handoff. Explain one before/after improvement using observed evidence. Identify a remaining physical unknown. If execution is blocked, preserve the complete package and identify the exact open runtime gate; do not fabricate a pass. Suggested practice time is 60–90 minutes including review and one revision cycle.

## Completion record

Record the checkpoint, changed files, checks actually performed, results, and open limitations. Keep expected output distinct from observed output. Preserve the starting copy and review the final diff before considering the artifact complete.