diff --git a/packages/server/src/terminal/worker-terminal-manager.test.ts b/packages/server/src/terminal/worker-terminal-manager.test.ts
index ffc9b18a45..7d91ec180e 100644
--- a/packages/server/src/terminal/worker-terminal-manager.test.ts
+++ b/packages/server/src/terminal/worker-terminal-manager.test.ts
@@ -1742,6 +1742,7 @@ it.skipIf(isPlatform("win32"))(
 
 it("replays bounded ANSI chunks independently of live output and reconstructs the revision cut", async () => {
   const cwd = createTemporaryHome();
+  const finishBefore = join(cwd, "finish-before");
   manager = await startRealWorkerManager();
   const session = trackTerminal(
     await manager.createTerminal({
@@ -1751,7 +1752,15 @@ it("replays bounded ANSI chunks independently of live output and reconstructs th
       cols: 120,
       ...nodeTerminalCommand(`
       for (let i = 0; i < 800; i++) process.stdout.write("\\x1b[31m" + String(i).padStart(4, "0") + ":" + "x".repeat(100) + "\\x1b[0m\\r\\n");
-      require("node:readline").createInterface({ input: process.stdin }).on("line", line => process.stdout.write(line === "before" ? "PRE-CUT\\r\\n" : "LIVE-AFTER-REPLAY\\r\\n"));
+      require("node:readline").createInterface({ input: process.stdin }).on("line", line => {
+        if (line !== "before") { process.stdout.write("LIVE-AFTER-REPLAY\\r\\n"); return; }
+        process.stdout.write("PRE-CUT");
+        const finish = setInterval(() => {
+          if (!require("node:fs").existsSync(${JSON.stringify(finishBefore)})) return;
+          clearInterval(finish);
+          process.stdout.write("\\r\\n");
+        }, 5);
+      });
       setInterval(() => {}, 1000);
     `),
     }),
@@ -1775,6 +1784,13 @@ it("replays bounded ANSI chunks independently of live output and reconstructs th
   });
   session.send({ type: "input", data: "before\r" });
   await waitForCondition(() => live.includes("PRE-CUT"), 10000);
+  // A PTY may deliver the marker and its trailing newline separately. Finish
+  // that output before replay, so the two captures must describe the same cut.
+  writeFileSync(finishBefore, "");
+  await waitForCondition(async () => {
+    const { lines } = await manager!.captureTerminal(session.id);
+    return lines.at(-2) === "PRE-CUT" && lines.at(-1) === "";
+  }, 10000);
   const expected = await manager.captureTerminal(session.id);
   const metadata = await manager.replayTerminal(session.id, undefined, (event) => {
     events.push(event.type);
diff --git a/packages/server/src/utils/test-fixtures/config-responsiveness.ts b/packages/server/src/utils/test-fixtures/config-responsiveness.ts
index 9e151c805a..787ad88674 100644
--- a/packages/server/src/utils/test-fixtures/config-responsiveness.ts
+++ b/packages/server/src/utils/test-fixtures/config-responsiveness.ts
@@ -1,4 +1,5 @@
 import { createHook, executionAsyncResource } from "node:async_hooks";
+import { stat } from "node:fs/promises";
 import { MessagePort } from "node:worker_threads";
 import assert from "node:assert/strict";
 import { setImmediate as nextTurn } from "node:timers/promises";
@@ -10,6 +11,11 @@ import { readPaseoConfigForEdit } from "../paseo-config-file.js";
 // Read the real file once, without warming the config snapshot or schema.
 const directory = process.argv[2];
 assert.ok(directory, "Config directory is required");
+// The daemon has already used asynchronous filesystem APIs before reading a
+// project config. Start libuv's filesystem worker pool outside the measurement:
+// its first submission synchronously creates workers in a fresh Node process.
+// Stat the probe itself so the config, snapshot and schemas remain cold.
+await stat(process.argv[1]);
 await nextTurn();
 let workerMessages = 0;
 const activity = createHook({