chore: clean up launched memory features (#26941)

Co-authored-by: Jenna Inouye <jinouye@google.com>

packages/cli/src/ui/hooks/atCommandProcessor.test.ts

@@ -94,6 +94,7 @@ describe('handleAtCommand', () => {
           p.startsWith(testRootDir) || p.startsWith('/private' + testRootDir),
         getDirectories: () => [testRootDir],
       }),
+      getMemoryContextManager: () => undefined,
       storage: {
         getProjectTempDir: () => path.join(os.tmpdir(), 'gemini-cli-temp'),
       },