test: trim memory hotspot fixture setup

extensions/memory-core/src/memory/index.test.ts

@@ -165,12 +165,6 @@ describe("memory index", () => {
     indexModelPath = path.join(workspaceDir, "index-model-change.sqlite");
     indexFtsOnlyPath = path.join(workspaceDir, "index-fts-only.sqlite");
     sourceChangeStateDir = path.join(fixtureRoot, "state-source-change");
-
-    await fs.mkdir(memoryDir, { recursive: true });
-    await fs.writeFile(
-      path.join(memoryDir, "2026-01-12.md"),
-      "# Log\nAlpha memory line.\nZebra memory line.",
-    );
   });
 
   afterAll(async () => {
@@ -195,10 +189,12 @@ describe("memory index", () => {
     providerCalls = [];
     forceNoProvider = false;
 
+    rmSync(workspaceDir, { recursive: true, force: true });
     mkdirSync(memoryDir, { recursive: true });
-
-    // Clean additional paths that may have been created by earlier cases.
-    rmSync(extraDir, { recursive: true, force: true });
+    await fs.writeFile(
+      path.join(memoryDir, "2026-01-12.md"),
+      "# Log\nAlpha memory line.\nZebra memory line.",
+    );
   });
 
   function resetManagerForTest(manager: MemoryIndexManager) {

extensions/memory-core/src/short-term-promotion.test.ts

@@ -1,7 +1,7 @@
 import fs from "node:fs/promises";
 import os from "node:os";
 import path from "node:path";
-import { describe, expect, it, vi } from "vitest";
+import { afterAll, beforeAll, describe, expect, it, vi } from "vitest";
 import {
   applyShortTermPromotions,
   auditShortTermPromotionArtifacts,
@@ -17,13 +17,24 @@ import {
 } from "./short-term-promotion.js";
 
 describe("short-term promotion", () => {
-  async function withTempWorkspace(run: (workspaceDir: string) => Promise<void>) {
-    const workspaceDir = await fs.mkdtemp(path.join(os.tmpdir(), "memory-promote-"));
-    try {
-      await run(workspaceDir);
-    } finally {
-      await fs.rm(workspaceDir, { recursive: true, force: true });
+  let fixtureRoot = "";
+  let caseId = 0;
+
+  beforeAll(async () => {
+    fixtureRoot = await fs.mkdtemp(path.join(os.tmpdir(), "memory-promote-"));
+  });
+
+  afterAll(async () => {
+    if (!fixtureRoot) {
+      return;
     }
+    await fs.rm(fixtureRoot, { recursive: true, force: true });
+  });
+
+  async function withTempWorkspace(run: (workspaceDir: string) => Promise<void>) {
+    const workspaceDir = path.join(fixtureRoot, `case-${caseId++}`);
+    await fs.mkdir(workspaceDir, { recursive: true });
+    await run(workspaceDir);
   }
 
   async function writeDailyMemoryNote(
@@ -1144,7 +1155,7 @@ describe("short-term promotion", () => {
         return result;
       });
 
-      await new Promise((resolve) => setTimeout(resolve, 80));
+      await new Promise((resolve) => setTimeout(resolve, 45));
       expect(settled).toBe(false);
 
       await fs.unlink(lockPath);