- I-1: Add explicit lower bounds to width assertions (>= 15 for autre, >= 40 for objet)
- I-2: Wrap write_excel() and close() in try/finally to ensure cleanup even on exception
- M-2: Add openpyxl to dev dependencies in pyproject.toml
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>