perf(test): mock chokidar in memory tests

src/memory/index.test.ts

@@ -6,6 +6,14 @@ import { getMemorySearchManager, type MemoryIndexManager } from "./index.js";
 
 let embedBatchCalls = 0;
 
+// Unit tests: avoid importing the real chokidar implementation (native fsevents, etc.).
+vi.mock("chokidar", () => ({
+  default: {
+    watch: () => ({ on: () => {}, close: async () => {} }),
+  },
+  watch: () => ({ on: () => {}, close: async () => {} }),
+}));
+
 vi.mock("./sqlite-vec.js", () => ({
   loadSqliteVecExtension: async () => ({ ok: false, error: "sqlite-vec disabled in tests" }),
 }));