fix(init): handle Ctrl+C during experimental warning gracefully

Catch WizardCancelledError inside confirmExperimental() so that
pressing Ctrl+C during the experimental confirm prompt exits cleanly
(exitCode 0) instead of propagating an unhandled error. Adds a test
for the Ctrl+C path.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: betegon

src/lib/init/wizard-runner.ts

@@ -175,17 +175,25 @@ function withTimeout<T>(
   });
 }
 
-/** Returns `true` if the user confirmed, `false` if they declined. */
+/**
+ * Returns `true` if the user confirmed, `false` if they declined or
+ * cancelled (Ctrl+C). Catches WizardCancelledError so that cancellation
+ * during the preamble exits cleanly instead of propagating unhandled.
+ */
 async function confirmExperimental(yes: boolean): Promise<boolean> {
   if (yes) {
     return true;
   }
-  const proceed = await confirm({
-    message:
-      "EXPERIMENTAL: This feature is experimental and may modify your code. Continue?",
-  });
-  abortIfCancelled(proceed);
-  return !!proceed;
+  try {
+    const proceed = await confirm({
+      message:
+        "EXPERIMENTAL: This feature is experimental and may modify your code. Continue?",
+    });
+    abortIfCancelled(proceed);
+    return !!proceed;
+  } catch {
+    return false;
+  }
 }
 
 /**

test/lib/init/wizard-runner.test.ts

@@ -23,6 +23,7 @@ import { MastraClient } from "@mastra/client-js";
 import * as banner from "../../../src/lib/banner.js";
 // biome-ignore lint/performance/noNamespaceImport: spyOn requires object reference
 import * as auth from "../../../src/lib/db/auth.js";
+import { WizardCancelledError } from "../../../src/lib/init/clack-utils.js";
 // biome-ignore lint/performance/noNamespaceImport: spyOn requires object reference
 import * as fmt from "../../../src/lib/init/formatters.js";
 // biome-ignore lint/performance/noNamespaceImport: spyOn requires object reference
@@ -275,6 +276,29 @@ describe("runWizard", () => {
       expect(process.exitCode).toBe(0);
       expect(formatResultSpy).not.toHaveBeenCalled();
     });
+
+    test("exits cleanly when user cancels experimental warning with Ctrl+C", async () => {
+      const origIsTTY = process.stdin.isTTY;
+      Object.defineProperty(process.stdin, "isTTY", {
+        value: true,
+        configurable: true,
+      });
+
+      // Simulate Ctrl+C: confirm rejects with WizardCancelledError
+      // (abortIfCancelled throws this when clack returns the cancel symbol)
+      confirmSpy.mockRejectedValue(new WizardCancelledError());
+
+      await runWizard(makeOptions({ yes: false }));
+
+      Object.defineProperty(process.stdin, "isTTY", {
+        value: origIsTTY,
+        configurable: true,
+      });
+
+      expect(cancelSpy).toHaveBeenCalledWith("Setup cancelled.");
+      expect(process.exitCode).toBe(0);
+      expect(formatResultSpy).not.toHaveBeenCalled();
+    });
   });
 
   describe("connection error", () => {