fix: close lifecycle and diagnostic review regressions

tests/backend/api/test_engines_route_shape.py

@@ -200,7 +200,7 @@ def test_audiocpp_runtime_installer_routes_are_desktop_scoped(
     )
     client = _client(fresh_app)
 
-    assert client.get("/engines/audiocpp/runtime/install/status").json() == payload
+    assert client.get("/engines/audiocpp/runtime/install/status").json() == {**payload, "install_allowed": True}
     response = client.post("/engines/audiocpp/runtime/install")
     assert response.status_code == 200
     assert response.json()["status"] == "started"

tests/test_engine_install_capability.py

@@ -1,14 +1,13 @@
 import httpx
 import pytest
 from fastapi import FastAPI
-from api.dependencies import require_admin
-from api.routers import engines
-from services import sidecar_install, audiocpp_runtime_install
 
 
 @pytest.mark.asyncio
 @pytest.mark.parametrize('host,allowed', [('127.0.0.1', True), ('::1', True), ('192.0.2.10', False)])
 async def test_catalogue_matches_native_install_boundary(host, allowed, monkeypatch):
+    from api.routers import engines
+    from services import sidecar_install, audiocpp_runtime_install
     payload = {'backends': [{'id': 'example', 'one_click_install': True, 'available': False}]}
     monkeypatch.setattr(engines, '_family_payload', lambda *args: payload)
     monkeypatch.setattr(sidecar_install, 'get_status', lambda engine: {'installed': False, 'job': None})
@@ -18,14 +17,16 @@ async def test_catalogue_matches_native_install_boundary(host, allowed, monkeypa
     monkeypatch.setattr(audiocpp_runtime_install, 'start_install', lambda: calls.append('native') or {'status': 'started'})
     app = FastAPI()
     app.include_router(engines.router)
-    app.dependency_overrides[require_admin] = lambda: None
+    app.dependency_overrides[engines.require_admin] = lambda: None
     async with httpx.AsyncClient(transport=httpx.ASGITransport(app=app, client=(host, 1234)), base_url='http://test') as client:
         listing = (await client.get('/engines')).json()['tts']['backends'][0]
         assert listing['one_click_install'] is allowed
         assert listing.get('local_install_required', False) is (not allowed)
         assert payload['backends'][0]['one_click_install'] is True  # no cached registry mutation
         for path in ['/engines/sidecar/example/install', '/engines/audiocpp/runtime/install']:
-            status = (await client.get(path + '/status')).json()
+            response = await client.get(path + '/status')
+            assert response.status_code == 200, response.text
+            status = response.json()
             assert status['install_allowed'] is allowed
             response = await client.post(path)
             assert response.status_code == (200 if allowed else 403)