Draft+approve REQ-005~009 from dcy-002 (slot-core daemon + API)

Decompose dcy-002 FR-1~FR-6 into five requirements and promote them to
Approved (gate passed; source dcy-002 confirmed):
- REQ-005 (Installation): slot-core daemon runtime + lifecycle/healthz
- REQ-006 (Data): PostgreSQL SlotRepository + schema + drift test
- REQ-007 (Interface): intent submission API + idempotency
- REQ-008 (Interface): read-only slot/capacity query API
- REQ-009 (Documentation): daemon/API/persistence baseline alignment

NFR-1/2/3 absorbed into REQ-006/007 acceptance. Update SRS index
(Next ID -> REQ-010, register, change log) and dcy-002 created-REQ refs.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/discovery/dcy-002_20260603_slot-core-daemon-http-api.md

@@ -5,10 +5,10 @@
 - 문서 ID: dcy-002_20260603_slot-core-daemon-http-api
 - 이슈명: trex-core 슬롯 코어 데몬화 + HTTP intent API
 - 작성 시각(KST): 2026-06-03
-- 마지막 갱신 시각(KST): 2026-06-03
+- 마지막 갱신 시각(KST): 2026-06-03 (draft-req)
 - 대체됨: 없음
 - 후속 Discovery 참조: 없음
-- 생성된 REQ 참조: 없음
+- 생성된 REQ 참조: REQ-005, REQ-006, REQ-007, REQ-008, REQ-009
 
 # 1. 계획 상태 요약
 현재 Discovery가 어떤 배경에서 작성되고 있는지, 연계 문서가 있는지, 지금 시점의 해석이 무엇인지 짧게 요약한다.