fix(retirement): close projection and launch contract gaps

Assistant: codex
Assistant-Model: gpt-5.6-sol
Assistant-Session: 01a02b7c-1c49-76a0-955a-49e7b3ddfc0d

api/routers/execution.py

@@ -21,9 +21,9 @@ from api.services.execution_queue import (
     ACTIVITY_CORE_RESPONSIBILITIES,
     CONCURRENCY_MODES,
     EXECUTION_STATES,
+    EXECUTION_REPLACEMENTS,
     LAUNCH_MODES,
     STATE_HUB_RESPONSIBILITIES,
-    execution_state_for_launch,
     queue_sort_key,
     workplan_blockers,
 )
@@ -43,6 +43,8 @@ async def execution_semantics() -> ExecutionSemantics:
         concurrency_modes=CONCURRENCY_MODES,
         state_hub_responsibility=STATE_HUB_RESPONSIBILITIES,
         activity_core_responsibility=ACTIVITY_CORE_RESPONSIBILITIES,
+        launch_requests_accepted=False,
+        replacements=EXECUTION_REPLACEMENTS,
     )
 
 
@@ -161,37 +163,27 @@ async def workplan_stack(
 
 @router.post(
     "/launch-requests",
-    response_model=LaunchRequestRead,
-    status_code=status.HTTP_201_CREATED,
+    status_code=status.HTTP_410_GONE,
 )
 async def create_launch_request(
+    request: Request,
+    response: Response,
     body: LaunchRequestCreate,
     session: AsyncSession = Depends(get_session),
-) -> WorkplanLaunchRequest:
-    ws = await session.get(Workplan, body.workplan_id)
-    if ws is None:
-        raise HTTPException(status_code=404, detail="Workplan not found")
-
-    launch_request = WorkplanLaunchRequest(
-        workplan_id=ws.id,
-        requested_by=body.requested_by,
-        requested_actor=body.requested_actor,
-        launch_mode=body.launch_mode,
-        concurrency_mode=body.concurrency_mode,
-        priority=body.priority or ws.planning_priority,
-        repo_id=body.repo_id or ws.repo_id,
-        branch_preference=body.branch_preference,
-        immediate_pickup=body.immediate_pickup,
-        notes=body.notes,
-        request_metadata=body.request_metadata,
+) -> None:
+    del body  # Request shape stays documented while the retired route returns 410.
+    await retire_legacy_route(
+        session=session,
+        request=request,
+        response=response,
+        interface_key="rest_api:POST /execution/launch-requests",
+        replacement_ref="repo file queue or activity-core ActivityDefinition + ops_run",
+        detail=(
+            "State Hub workplan launch requests are retired: no consumer picks up these rows. "
+            "Queue development work in the authoritative repository file; use an "
+            "ActivityDefinition and activity-core ops_run only for recurring or operational fires."
+        ),
     )
-    ws.launch_mode = body.launch_mode
-    ws.concurrency_mode = body.concurrency_mode
-    ws.execution_state = execution_state_for_launch(body.launch_mode, body.immediate_pickup)
-    session.add(launch_request)
-    await session.commit()
-    await session.refresh(launch_request)
-    return launch_request
 
 
 @router.get("/launch-requests", response_model=list[LaunchRequestRead])