Add comprehensive README files for all 9 built-in profiles (invoice,
receipt, contract, scientific_paper, slide_deck, form, bank_statement,
legal_filing, book_chapter). Each README includes:
- Match Criteria Summary: prose description of what makes a document match
- Extracted Fields table: field_name, type, description, example, source_hint
- Known Limitations: bullet list of edge cases and failure modes
- Sample Input Pointer: links to fixtures directory
- Configuration Tips: how to override via --profile or export
The xtask doc-profile skeleton generator was already implemented
and was used to generate the initial skeleton, which was then enhanced
with profile-specific human-authored content.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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