test(cli): mock PATH in scanPathExecutables test to prevent timeouts

Isolate the test from the real system PATH by using a small controlled directory.
This prevents timeouts on Windows in CI where scanning large PATHs can take too long.

TAG=agy
CONV=4043d296-611e-448a-a9d9-cd78f122b436

Author: akh64bit

packages/cli/src/ui/hooks/useShellCompletion.test.ts

@@ -5,6 +5,7 @@
  */
 
 import { describe, it, expect, afterEach, vi } from 'vitest';
+import * as path from 'node:path';
 import {
   getTokenAtCursor,
   escapeShellPath,
@@ -382,15 +383,28 @@ describe('useShellCompletion utilities', () => {
 
   describe('scanPathExecutables', () => {
     it('should return an array of executables', async () => {
-      const results = await scanPathExecutables();
-      expect(Array.isArray(results)).toBe(true);
-      // Very basic sanity check: common commands should be found
-      if (process.platform !== 'win32') {
-        expect(results).toContain('ls');
-      } else {
-        expect(results).toContain('dir');
-        expect(results).toContain('cls');
-        expect(results).toContain('copy');
+      const isWin = process.platform === 'win32';
+      const exeName = isWin ? 'my-test-exe.exe' : 'my-test-exe';
+      const structure: FileSystemStructure = {
+        [exeName]: '',
+      };
+      const testTmpDir = await createTmpDir(structure);
+
+      // Make it executable on non-Windows
+      if (!isWin) {
+        const fsPromises = await import('node:fs/promises');
+        await fsPromises.chmod(path.join(testTmpDir, exeName), 0o755);
+      }
+
+      vi.stubEnv('PATH', testTmpDir);
+
+      try {
+        const results = await scanPathExecutables();
+        expect(Array.isArray(results)).toBe(true);
+        expect(results).toContain(isWin ? 'my-test-exe.exe' : 'my-test-exe');
+      } finally {
+        await cleanupTmpDir(testTmpDir);
+        vi.unstubAllEnvs();
       }
     });