feat(analysis): add check_analysis_approved QG with stakeholder approval requirement

- stages.py: QG renamed to check_analysis_approved (requires :approved: comment)
- qg/checks.py: new check_analysis_approved verifies files + Plane :approved: comment
- launcher.py: skip auto-advance for analysis stage (requires human approval)
- plane.py: route check_analysis_approved in _try_advance_stage
- docs/ARCHITECTURE.md: updated QG table and flow description

docs/ARCHITECTURE.md

@@ -24,7 +24,7 @@ Orchestrator — event-driven FastAPI сервис, который управл
 ```
 STAGE_TRANSITIONS = {
     created:      → analysis      (agent: None)
-    analysis:     → architecture  (agent: architect,  QG: check_analysis_complete)
+    analysis:     → architecture  (agent: architect,  QG: check_analysis_approved)
     architecture: → development   (agent: developer,  QG: check_architecture_done)
     development:  → review        (agent: reviewer,   QG: check_ci_green)
     review:       → testing       (agent: tester,     QG: check_review_approved)
@@ -37,7 +37,7 @@ STAGE_TRANSITIONS = {
 
 | Check | Метод проверки |
 |-------|---------------|
-| check_analysis_complete | Filesystem: 4 файла в docs/work-items/{id}/ |
+| check_analysis_approved | Filesystem: 4 файла + :approved: comment в Plane |
 | check_architecture_done | Filesystem: ADR dir или infra-requirements.md |
 | check_ci_green | Gitea API: GET /commits/{branch}/status |
 | check_review_approved | Gitea API: GET /pulls/{n}/reviews (skip stale) |
@@ -145,7 +145,7 @@ services:
 ```
 1. Plane webhook: work_item.created → task created, analyst launched
 2. Analyst: пишет BRD/TRZ/AC/TestPlan → git push docs/
-3. Gitea push webhook: docs/ detected → QG check_analysis_complete → PASS
+3. Plane comment :approved: → QG check_analysis_approved → PASS
 4. Auto-advance: analysis → architecture, architect launched
 5. Architect: пишет ADR, infra-requirements → git push docs/
 6. Gitea push webhook: ADR detected → QG check_architecture_done → PASS