perf(test): speed up memory suites

src/memory/qmd-manager.test.ts

@@ -1009,12 +1009,16 @@ describe("QmdMemoryManager", () => {
 });
 
 async function waitForCondition(check: () => boolean, timeoutMs: number): Promise<void> {
-  const deadline = Date.now() + timeoutMs;
-  while (Date.now() < deadline) {
+  // Tests only need to yield the event loop a few times; real-time sleeps slow the suite down.
+  const maxTicks = Math.max(10, Math.min(5000, timeoutMs * 5));
+  for (let tick = 0; tick < maxTicks; tick += 1) {
     if (check()) {
       return;
     }
     await new Promise<void>((resolve) => setImmediate(resolve));
   }
+  if (check()) {
+    return;
+  }
   throw new Error("condition was not met in time");
 }