fix(gateway): repair routing health and MCP command wiring

apps/gateway/src/reload/reload.service.spec.ts

@@ -143,6 +143,12 @@ describe('ReloadService — /reload command sanitizes plugin errors', () => {
     const mockSessionGC = { sweepOrphans: vi.fn() };
     const mockBrain = { agents: { findByName: vi.fn(), findById: vi.fn(), create: vi.fn() } };
 
+    const mockMcpClient = {
+      getServerStatuses: vi.fn(() => []),
+      getToolDefinitions: vi.fn(() => []),
+      reconnectServer: vi.fn().mockResolvedValue(undefined),
+    };
+
     const executor = new CommandExecutorService(
       registry as never,
       mockAgentService as never,
@@ -152,7 +158,7 @@ describe('ReloadService — /reload command sanitizes plugin errors', () => {
       mockBrain as never,
       reloadService,
       mockChatGateway as never,
-      null,
+      mockMcpClient as never,
     );
 
     const payload: SlashCommandPayload = { command: 'reload', conversationId: 'conv-1' };