**Motivations:** - Ajout skill pour amélioration de documents en background - Scripts et documentation Collatz **Evolutions:** - .cursor/skills/document-improvement/ (SKILL, reference, examples) - v0/collatz_k_scripts/ (core, fusion, pipeline, utils, reproduce) - v0/journal.md, v0/log.md, v0/README collatz **Pages affectées:** - .cursor/skills/document-improvement/ - v0/collatz_k_scripts/ - v0/journal.md, v0/log.md