chore: import upstream snapshot with attribution

tests/unit/cli-io.test.ts

@@ -0,0 +1,33 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+
+// Regression: the shared interactive prompt helper (createPrompt) used rl.question
+// without an EOF guard, so a non-interactive stdin (pipe, CI, `< /dev/null`) left
+// the promise pending — Node then warned about an "unsettled top-level await" at
+// exit and the command hung. ask/askSecret now resolve on the readline `close`
+// event (fired on EOF) with the default / empty string instead of hanging. close()
+// here simulates that EOF/non-interactive close.
+
+test("createPrompt.ask resolves the default on EOF (non-interactive, no hang)", async () => {
+  const { createPrompt } = await import("../../bin/cli/io.mjs");
+  const p = createPrompt();
+  const pending = p.ask("Name", "fallback");
+  p.close();
+  assert.equal(await pending, "fallback");
+});
+
+test("createPrompt.ask resolves empty when there is no default on EOF", async () => {
+  const { createPrompt } = await import("../../bin/cli/io.mjs");
+  const p = createPrompt();
+  const pending = p.ask("Name");
+  p.close();
+  assert.equal(await pending, "");
+});
+
+test("createPrompt.askSecret resolves empty on EOF (no hang)", async () => {
+  const { createPrompt } = await import("../../bin/cli/io.mjs");
+  const p = createPrompt();
+  const pending = p.askSecret("Secret");
+  p.close();
+  assert.equal(await pending, "");
+});