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chunk_section_analysis 테이블(migration 286) + ORM model + pilot script. document_chunks(retrieval-hot)와 분리된 절-레벨 분석 축. domain 상속, section_type 절-전용 역할 enum, status로 skip 박제, source_content_hash로 stale 탐지. script-only(scripts mount, rebuild 불필요). LLM 0 dry-run 검증 = 5225 147 analyze + 17 skip. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>