Moments test waits for the server to exit before removing its folder

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

test/moments.test.js

@@ -143,7 +143,8 @@ test('moments are private, validated, editable and survive page renumbering as "
     assert.equal((await post(alice, '/api/moments/delete', { id: spread.id })).status, 200);
     assert.equal((await get(alice, '/api/moments?m=Moon%20Garden')).moments.length, 1);
   } finally {
-    if (child) child.kill();
+    // The server writes db.json on SIGTERM; removing the folder before it exits races that write.
+    if (child && child.exitCode === null) await new Promise(resolve => { child.once('exit', resolve); child.kill(); });
     fs.rmSync(root, { recursive: true, force: true });
   }
 });