fix: resolve duplicate option registration in export and import commands

The `export` and `import` commands each registered the same required
option twice (once for gemini, once for codex), causing commander to
throw on startup and making the entire CLI unusable.

Additionally, `case 'codex'` was placed inside the `default` branch
in both switch statements, so it could never be matched correctly.

Changes:
- Merge duplicate `.requiredOption()` calls into a single call listing
  all supported formats
- Move `case 'codex'` out of `default` as an independent case with
  its own `break`

Fixes #53

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

Author: tianhaocui

src/commands/export.ts

@@ -25,8 +25,7 @@ interface ExportOptions {
 
 export const exportCommand = new Command('export')
   .description('Export agent to other formats')
-.requiredOption('-f, --format <format>', 'Export format (system-prompt, claude-code, openai, crewai, openclaw, nanobot, lyzr, github, copilot, opencode, cursor, gemini)')
-.requiredOption('-f, --format <format>', 'Export format (system-prompt, claude-code, openai, crewai, openclaw, nanobot, lyzr, github, copilot, opencode, cursor, codex)')
+.requiredOption('-f, --format <format>', 'Export format (system-prompt, claude-code, openai, crewai, openclaw, nanobot, lyzr, github, copilot, opencode, cursor, gemini, codex)')
   .option('-d, --dir <dir>', 'Agent directory', '.')
   .option('-o, --output <output>', 'Output file path')
   .action(async (options: ExportOptions) => {
@@ -75,12 +74,12 @@ export const exportCommand = new Command('export')
 case 'gemini':
           result = exportToGeminiString(dir);
           break;
+        case 'codex':
+          result = exportToCodexString(dir);
+          break;
         default:
           error(`Unknown format: ${options.format}`);
-          info('Supported formats: system-prompt, claude-code, openai, crewai, openclaw, nanobot, lyzr, github, copilot, opencode, cursor, gemini');
-case 'codex':
-          result = exportToCodexString(dir);
-          info('Supported formats: system-prompt, claude-code, openai, crewai, openclaw, nanobot, lyzr, github, copilot, opencode, cursor, codex');
+          info('Supported formats: system-prompt, claude-code, openai, crewai, openclaw, nanobot, lyzr, github, copilot, opencode, cursor, gemini, codex');
           process.exit(1);
       }
 

src/commands/import.ts

@@ -521,8 +521,7 @@ function parseSections(markdown: string): [string, string][] {
 
 export const importCommand = new Command('import')
   .description('Import from other agent formats')
-.requiredOption('--from <format>', 'Source format (claude, cursor, crewai, opencode, gemini)')
-.requiredOption('--from <format>', 'Source format (claude, cursor, crewai, opencode, codex)')
+.requiredOption('--from <format>', 'Source format (claude, cursor, crewai, opencode, gemini, codex)')
   .argument('<path>', 'Source file or directory path')
   .option('-d, --dir <dir>', 'Target directory', '.')
   .action((sourcePath: string, options: ImportOptions) => {
@@ -549,12 +548,12 @@ export const importCommand = new Command('import')
 case 'gemini':
           importFromGemini(sourcePath, targetDir);
           break;
+        case 'codex':
+          importFromCodex(sourcePath, targetDir);
+          break;
         default:
           error(`Unknown format: ${options.from}`);
-          info('Supported formats: claude, cursor, crewai, opencode, gemini');
-case 'codex':
-          importFromCodex(sourcePath, targetDir);
-          info('Supported formats: claude, cursor, crewai, opencode, codex');
+          info('Supported formats: claude, cursor, crewai, opencode, gemini, codex');
           process.exit(1);
       }