fix(gateway): remove duplicate mockBrain declaration and fix prettier formatting after rebase

Rebase conflict resolution introduced a duplicate `mockBrain` variable in
commands.integration.spec.ts. Also fixes prettier formatting on
command-executor-p8012.spec.ts that was introduced during conflict resolution.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

apps/gateway/src/commands/command-executor-p8012.spec.ts

@@ -72,7 +72,6 @@ const mockChatGateway = {
   broadcastSessionInfo: vi.fn(),
 };
 
-
 function buildService(): CommandExecutorService {
   return new CommandExecutorService(
     mockRegistry as never,

apps/gateway/src/commands/commands.integration.spec.ts

@@ -55,14 +55,6 @@ function buildRegistry(): CommandRegistryService {
   return svc;
 }
 
-const mockBrain = {
-  agents: {
-    findByName: vi.fn().mockResolvedValue(undefined),
-    findById: vi.fn().mockResolvedValue(undefined),
-    create: vi.fn(),
-  },
-};
-
 function buildExecutor(registry: CommandRegistryService): CommandExecutorService {
   return new CommandExecutorService(
     registry as never,