fix(gateway): scope assertion to check only injection-related log messages

The test "does not log when no memories or goals are injected" was
checking mockLogInfo.not.toHaveBeenCalled() — too broad since
mockLogInfo intercepts all getLog().info() calls in the gateway,
including infrastructure logs (PostgreSQL, Schema init) that fire
during test execution.

Now checks: mockLogInfo.not.toHaveBeenCalledWith(expect.stringContaining('Injected'))
This correctly verifies the middleware doesn't log its own injection
message while allowing unrelated infrastructure logs to pass.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: ersinkoc

packages/gateway/src/services/middleware/pipeline-middleware.test.ts

@@ -1157,7 +1157,7 @@ describe('Pipeline Middleware', () => {
 
       await middleware(message, ctx, next);
 
-      expect(mockLogInfo).not.toHaveBeenCalled();
+      expect(mockLogInfo).not.toHaveBeenCalledWith(expect.stringContaining('Injected'));
     });
 
     it('serves subsequent calls from cache (skips buildEnhancedSystemPrompt)', async () => {