feat(engineering): enforce V1-0 write invariants

src/atocore/api/routes.py

@@ -1457,6 +1457,11 @@ class EntityCreateRequest(BaseModel):
     status: str = "active"
     confidence: float = 1.0
     source_refs: list[str] | None = None
+    # V1-0 provenance enforcement (F-8). Clients must either pass
+    # non-empty source_refs or set hand_authored=true. The service layer
+    # raises ValueError otherwise, surfaced here as 400.
+    hand_authored: bool = False
+    extractor_version: str | None = None
 
 
 class EntityPromoteRequest(BaseModel):
@@ -1486,6 +1491,8 @@ def api_create_entity(req: EntityCreateRequest) -> dict:
             confidence=req.confidence,
             source_refs=req.source_refs,
             actor="api-http",
+            hand_authored=req.hand_authored,
+            extractor_version=req.extractor_version,
         )
     except ValueError as e:
         raise HTTPException(status_code=400, detail=str(e))