docs: CLAUDE 3구역 정책 + DOCS.md 지도 + component README task-spec 링크 정리

doc-reorg(C) Phase 4b+5:
- CLAUDE.md: doc-list 에 DOCS.md/CHANGELOG 추가 + zones(living/계약/증거) 정책 +
  "새 plan/handoff/per-feature spec 누적 금지(결정→HOTFIXES, 구조→ARCHITECTURE,
  릴리스→CHANGELOG)" 명문화. §Spec contract 재작성(task spec 삭제 반영: 유일
  frozen 계약 = 설계 doc, 구현 진실 = 코드). stale per-task-spec 참조 정정.
- docs/components/*/README.md (12): 삭제될 tasks/p*/ task-spec markdown 링크
  제거/plain-text 화 + 흡수된 crate(kebab-normalize→parse-md::normalize,
  kebab-parse-types→parse-md::types) 참조 정정.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012Mc6W1fgsrbFKTsqA6P8La

docs/components/search/README.md

@@ -126,7 +126,5 @@ flowchart LR
 ## 관련 spec / HOTFIXES
 
 - frozen 설계 §3.7 (SearchHit), §6.4 (`search.hybrid_fusion`/`rrf_k`/`default_k`/`snippet_chars`), §0 Q3 (citation), §7.2 (`Retriever` trait): [`docs/superpowers/specs/2026-04-27-kebab-final-form-design.md`](../../superpowers/specs/2026-04-27-kebab-final-form-design.md)
-- task spec:
-  - lexical: [`tasks/p2/p2-2-search-lexical.md`](../../../tasks/p2/p2-2-search-lexical.md)
-  - vector + hybrid: [`tasks/p3/p3-4-hybrid-fusion.md`](../../../tasks/p3/p3-4-hybrid-fusion.md)
+- task specs: 삭제됨(2026-06-27 doc-reorg) — 설계는 frozen 계약, 동작은 tasks/HOTFIXES.md, 상세 git history.
 - HOTFIXES (RRF `fusion_score [0,1]` 정규화): [`tasks/HOTFIXES.md`](../../../tasks/HOTFIXES.md)