feat: add CodeX support (#44)

Co-authored-by: Viet Tran <viettranx@gmail.com>

cli/src/utils/detect.ts

@@ -28,6 +28,8 @@ export function detectAIType(cwd: string = process.cwd()): DetectionResult {
   if (existsSync(join(cwd, '.kiro'))) {
     detected.push('kiro');
   }
+  if (existsSync(join(cwd, '.codex'))) {
+    detected.push('codex');
   if (existsSync(join(cwd, '.roo'))) {
     detected.push('roocode');
   }
@@ -57,6 +59,8 @@ export function getAITypeDescription(aiType: AIType): string {
       return 'GitHub Copilot (.github/prompts/ + .shared/)';
     case 'kiro':
       return 'Kiro (.kiro/steering/ + .shared/)';
+    case 'codex':
+      return 'Codex (.codex/skills/ + .shared/)';
     case 'roocode':
       return 'RooCode (.roo/commands/ + .shared/)';
     case 'all':

cli/src/utils/extract.ts

@@ -39,7 +39,7 @@ export async function copyFolders(
   const copiedFolders: string[] = [];
 
   const foldersToCopy = aiType === 'all'
-    ? ['.claude', '.cursor', '.windsurf', '.agent', '.github', '.kiro', '.roo', '.shared']
+    ? ['.claude', '.cursor', '.windsurf', '.agent', '.github', '.kiro', '.roo','.codex', '.shared']
     : AI_FOLDERS[aiType];
 
   // Deduplicate folders (e.g., .shared might be listed multiple times)