diff --git a/CLAUDE.md b/CLAUDE.md
index 0e70caed8..ba5232c0b 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -439,6 +439,7 @@ npm run dev                   # Start server (port 3000) + client dev server (po
 | `npm run dev:client`       | Start only the Webpack dev server                           |
 | `npm run build`            | Build all packages (shared -> client -> server)             |
 | `npm test`                 | Run all tests                                               |
+| `npm run test:collect`     | List all tests (suites + names) without executing them      |
 | `npm run lint`             | Lint all code                                               |
 | `npm run format`           | Format all code                                             |
 | `npm run typecheck`        | Type-check all packages                                     |
diff --git a/jest.config.ts b/jest.config.ts
index 566fddbfc..3bf98fbf0 100644
--- a/jest.config.ts
+++ b/jest.config.ts
@@ -40,6 +40,12 @@ const config: Config = {
   // Locally, use up to 2 workers and recycle when heap exceeds 512 MB.
   // CI auto-detects workers (GitHub Actions sets CI=true).
   ...(isCI ? {} : { maxWorkers: 2, workerIdleMemoryLimit: '512M' }),
+  // Give workers 2 s to release file-watchers and jsdom handles after tests
+  // complete before force-killing. The 500 ms default is too tight in the
+  // resource-constrained sandbox and produces spurious "worker failed to exit
+  // gracefully" warnings; 2000 ms lets legitimate cleanup finish while still
+  // bounding true hangs.
+  workerGracefulExitTimeout: 2000,
   projects: [
     {
       ...baseConfig,
diff --git a/package.json b/package.json
index fb93019c0..5880178d2 100644
--- a/package.json
+++ b/package.json
@@ -22,6 +22,8 @@
     "test": "node --experimental-vm-modules node_modules/.bin/jest",
     "test:watch": "node --experimental-vm-modules node_modules/.bin/jest --watch",
     "test:coverage": "node --experimental-vm-modules node_modules/.bin/jest --coverage",
+    "test:collect": "node --experimental-vm-modules node_modules/.bin/jest --collectTests",
+    "test:collect:json": "node --experimental-vm-modules node_modules/.bin/jest --collectTests --json",
     "test:e2e": "npm test -w e2e",
     "test:e2e:shard": "npm run test:shard -w e2e",
     "test:e2e:smoke": "npm run test:smoke -w e2e",