Each sheet becomes NN-<sheet>.tsv (RFC 4180, tab-delimited, A1-aligned) in a <stem>.sheets/ folder beside the .md; sheets with formulas also get a .formulas.tsv. derived.md is the overview. Adds testfiles/ with a CI test. Files changed: - .gitattributes - CHANGES.md - VERSION - docs/dev/development.md - docs/how-to/ingest-a-source.md - docs/reference/commands/raw-material-and-uploads.md - raw/CONTRACT.md - testfiles/README.md - tools/CONTRACT.md - tools/chemenu/commands/raw_cmd.py - tools/chemenu/filters/__init__.py - tools/chemenu/filters/archive.py - tools/chemenu/filters/ooxml.py - tools/chemenu/tests/test_raw_derive.py - tools/chemenu/tests/test_raw_derive_testfiles.py Co-Authored-By: Claude Code <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2