322e2d9cb3
Replace plain recursive chunker with legal-aware chunking that: - Detects legal section headers (§, Art., Section, Chapter, Annex) - Adds section context prefix to every chunk - Splits on paragraph boundaries then sentence boundaries - Protects DE + EN abbreviations (80+ patterns) from false splits - Supports language detection for locale-specific processing - Force-splits overlong sentences at word boundaries The old plain_recursive API option is removed — all non-semantic strategies now route through chunk_text_legal(). Includes 40 tests covering header detection, abbreviation protection, sentence splitting, and legal chunking behavior. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>