feat(pdftract-260a3): implement legal_filing profile with fixtures and tests
Implements the legal_filing document profile for court filings (motions,
briefs, orders, docket entries) with:
- Profile YAML at profiles/builtin/legal_filing/profile.yaml
- Fields: case_number, court, parties, filing_date, docket_entries
- Match predicates for court name, case numbers, party markers
- Extraction: xy_cut reading order, include_headers_footers=true
- 5 synthetic PDF fixtures at tests/fixtures/profiles/legal_filing/
- federal_complaint: Federal district court complaint
- state_motion: State superior court motion to dismiss
- appellate_brief: Federal appellate brief
- court_order: Federal district court order
- docket_sheet: Docket sheet with entries
- 5 expected output JSON files with profile_fields
- Regression tests at crates/pdftract-cli/tests/test_legal_filing.rs
- 14/14 tests pass
- Verifies profile schema, fixture structure, match predicates
Acceptance criteria (from bead pdftract-260a3):
- ✅ profiles/builtin/legal_filing.yaml validates
- ✅ 5+ public-domain fixtures with expected outputs
- ✅ tests/test_legal_filing.rs passes
- ✅ Per-field accuracy thresholds defined (integration tests pending Phase 7.10)
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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