docs: add rel-002 release and transition REQ-011, REQ-012, REQ-015 to Implemented

Release: rel-002_20260511_operator-cli-tooling-and-baseline-docs-sync

Requirements Completed:
- REQ-011: baseline docs update for trex-basic contract (BAT-008 verification passed)
- REQ-012: service-token rotate CLI command (BAT-002 verification passed)
- REQ-015: broker credential CLI command group (BAT-005 verification passed)

Release Contents:
- Operator CLI tooling with service-token rotate and broker credential management
- Baseline documentation synchronized with trex-basic interface contract
- Complete v1 API and portfolio ownership model documentation

Documentation Updates:
- Create rel-002 release document with included batches and deployment notes
- Update docs/releases/index.md with release entry
- Add implementation evidence to REQ-011, REQ-012, REQ-015
- Update SRS index with Implemented status transitions and change log

docs/srs/Documentation/req-011_baseline-docs-update-for-trex-basic-contract.md

@@ -1,6 +1,6 @@
 # req-011: trex-basic 계약 반영을 위한 baseline 문서 갱신
 
-- Status: Approved
+- Status: Implemented
 - Type: Documentation
 - Priority: Medium
 - Owner: repository-maintainers
@@ -32,6 +32,41 @@
 
 ## Change Log
 
+### CHG-20260511-01
+- Date: 2026-05-11
+- Author: repository-maintainers
+
+#### Change Summary
+- Implemented 전환 — BAT-008 verification passed, confirm-req-implemented 게이트 통과
+
+#### Intent
+- BAT-008 verification.md에서 REQ-011 AC-1~3의 문서화 기준과 evidence가 모두 PASS로 확인되어 Implemented로 승격한다.
+
+#### Acceptance Criteria Delta
+- Added: none
+- Updated: none
+- Removed: none
+
+#### Impacted Area Delta
+- Docs: none
+- Modules: none
+- Tests: none
+
+#### Delivery Trace Delta
+- Batches:
+  - BAT-008 (release-candidate)
+- Releases:
+  - none
+
+#### Revalidation Impact
+- Reverification Needed: no
+- Existing Implementation Invalidated: no
+- Status Recommendation: implemented
+- Follow-up Action: draft-release 시 BAT-008 포함 여부 검토
+
+#### Validation Plan
+- BAT-008 verification.md의 REQ-011 AC-1~3 evidence와 Ready for Release: true 확인
+
 ### CHG-20260502-02
 - Date: 2026-05-02
 - Author: repository-maintainers