feat(pipeline): G-pre1/2/3 — Object Clustering + Master Controls + API

G-pre1: 144k objects clustered into 7,466 groups via Mini-Batch K-Means
  on bge-m3 embeddings. Two-stage: k=5000 base + sub-cluster groups >50.
G-pre2: 5,114 Master Controls from lifecycle phase chains
  (define→implement→test→monitor), linking 172,504 atomic controls.
G-pre3: REST API for Master Controls
  GET /v1/master-controls (list, search, filter)
  GET /v1/master-controls/stats
  GET /v1/master-controls/{mc_id} (detail with phase-controls)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

control-pipeline/api/__init__.py

@@ -4,9 +4,11 @@ from api.control_generator_routes import router as generator_router
 from api.canonical_control_routes import router as canonical_router
 from api.document_compliance_routes import router as document_router
 from api.dependency_routes import router as dependency_router
+from api.master_control_routes import router as master_control_router
 
 router = APIRouter()
 router.include_router(generator_router)
 router.include_router(canonical_router)
 router.include_router(document_router)
 router.include_router(dependency_router)
+router.include_router(master_control_router)