fix(#707): scope session GC retention (#720)

apps/gateway/src/commands/command-executor-tess-security.spec.ts

@@ -103,7 +103,10 @@ describe('TESS-M1-SEC-001 command authorization abuse cases', () => {
     expect(denied.success).toBe(false);
     expect(denied.message).toContain('approval');
     expect(approval).not.toBeNull();
-    expect(approved.success).toBe(true);
-    expect(sessionGc.sweepOrphans).toHaveBeenCalledOnce();
+    // A valid durable approval is consumed, but cannot authorize an unimplemented
+    // global retention operation. Session-scoped cleanup remains lifecycle-only.
+    expect(approved.success).toBe(false);
+    expect(approved.message).toContain('Global GC is disabled');
+    expect(sessionGc.sweepOrphans).not.toHaveBeenCalled();
   });
 });