fix(gateway): align session mocks and persist normalized push provider

src/companion/platformClients.integration.test.ts

@@ -31,6 +31,7 @@ const mockSession = {
 
 const mockSessionManager = {
   getSession: vi.fn(() => mockSession),
+  getSessionConfig: vi.fn(() => undefined),
   listSessions: vi.fn(() => ['ws:test']),
   transferSession: vi.fn(),
   closeSession: vi.fn(),

src/companion/runtimeClient.test.ts

@@ -28,6 +28,7 @@ const mockSession = {
 
 const mockSessionManager = {
   getSession: vi.fn(() => mockSession),
+  getSessionConfig: vi.fn(() => undefined),
   listSessions: vi.fn(() => ['ws:test']),
   transferSession: vi.fn(),
   closeSession: vi.fn(),