Track which document repealed each section

[marcarl]

Summary

Implements the selex:upphavd_av attribute to track which ändringsförfattning repealed each section. This resolves the TODO comment at formatters/format_sfs_text.py:718.

Changes

New files:

• temporal/parse_anteckningar.py - Parser for Swedish amendment notes (anteckningar)
  • Extracts repealed (upph.), amended (ändr.), and new (ny/nya) paragraphs
  • Handles various formats: upph. 29 kap. 15, 16 §§
  • 92% test coverage
• test/test_parse_anteckningar.py - Comprehensive test suite (27 tests)

Modified files:

• sfs_processor.py - Build repeal_map from andringsforfattningar and pass to formatter
• formatters/format_sfs_text.py - Add selex:upphavd_av attribute with ID normalization
• test/test_format_sfs_text.py - Integration tests for repeal_map functionality (8 tests)

Example Output

Before:

<section class="paragraf" selex:status="upphavd" selex:upphor_datum="2015-07-01">

After:

<section class="paragraf" selex:status="upphavd" selex:upphor_datum="2015-07-01" selex:upphavd_av="2015:73">

Testing

• ✅ All 68 tests passing
• ✅ No regressions in existing functionality
• ✅ Validated with real data from 2010:800.json
• ✅ Backward compatible (works without repeal_map)

Scope

Phase 1 (this PR):

• Simple paragraph-level repeals: upph. 15 §, upph. 29 kap. 15 §
• Multiple paragraphs: upph. 29 kap. 15, 16 §§
• Paragraph letters: upph. 29 kap. 22 a §

Phase 2 (future):

• Chapter-level repeals: upph. 23 kap.
• Paragraph renumbering: betecknas
• Complex patterns

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