fix(codex): prefer cmd wrappers over powershell on windows

- keep Windows Codex detection on the npm cmd shim when available

- add regression tests for cmd-first and ps1-to-cmd fallback selection

src/targets/codex-detector.ts

@@ -10,17 +10,26 @@ const CODEX_CONFIG_OVERRIDE_PROBE_ARGS = ['-c', 'model="gpt-5"', '--version'];
 function buildWindowsCodexCandidates(matches: string[]): string[] {
   const shellCandidates = matches.filter((entry) => /\.(exe|cmd|bat|ps1)$/i.test(entry));
   const bareCandidates = matches.filter((entry) => !/\.(exe|cmd|bat|ps1)$/i.test(entry));
-  const prioritized: string[] = [];
+  const prioritized = shellCandidates.map((entry) => {
-
+    if (!/\.ps1$/i.test(entry)) {
-  for (const entry of shellCandidates) {
+      return entry;
-    if (/\.(cmd|bat)$/i.test(entry)) {
-      prioritized.push(entry.replace(/\.(cmd|bat)$/i, '.ps1'));
-    }
-    prioritized.push(entry);
     }
 
-  prioritized.push(...bareCandidates);
+    for (const preferredExtension of ['.cmd', '.bat', '.exe']) {
-  return [...new Set(prioritized)];
+      const siblingCandidate = entry.replace(/\.ps1$/i, preferredExtension);
+      try {
+        if (fs.statSync(siblingCandidate).isFile()) {
+          return siblingCandidate;
+        }
+      } catch {
+        // Ignore missing sibling wrappers and keep the original PowerShell path.
+      }
+    }
+
+    return entry;
+  });
+
+  return [...new Set([...prioritized, ...bareCandidates])];
 }
 
 function runCodexProbe(codexPath: string, args: string[]): string | undefined {

tests/unit/targets/codex-detector.test.ts

@@ -73,7 +73,7 @@ describe('codex-detector', () => {
     execFileSyncSpy.mockRestore();
   });
 
-  it('prefers a sibling PowerShell wrapper over cmd when Windows PATH only exposes codex.cmd', () => {
+  it('keeps the cmd wrapper when Windows PATH exposes codex.cmd and a sibling ps1 also exists', () => {
     const fakeCmdCodex = path.join(tmpDir, 'codex.cmd');
     const fakePsCodex = path.join(tmpDir, 'codex.ps1');
     fs.writeFileSync(fakeCmdCodex, '');
@@ -82,7 +82,21 @@ describe('codex-detector', () => {
 
     const execSyncSpy = spyOn(childProcess, 'execSync').mockImplementation(() => `${fakeCmdCodex}\n`);
 
-    expect(detectCodexCli()).toBe(fakePsCodex);
+    expect(detectCodexCli()).toBe(fakeCmdCodex);
+
+    execSyncSpy.mockRestore();
+  });
+
+  it('replaces a Windows PowerShell wrapper with a sibling cmd shim when PATH returns codex.ps1', () => {
+    const fakeCmdCodex = path.join(tmpDir, 'codex.cmd');
+    const fakePsCodex = path.join(tmpDir, 'codex.ps1');
+    fs.writeFileSync(fakeCmdCodex, '');
+    fs.writeFileSync(fakePsCodex, '');
+    Object.defineProperty(process, 'platform', { value: 'win32' });
+
+    const execSyncSpy = spyOn(childProcess, 'execSync').mockImplementation(() => `${fakePsCodex}\n`);
+
+    expect(detectCodexCli()).toBe(fakeCmdCodex);
 
     execSyncSpy.mockRestore();
   });