fix: resolve duplicate requiredOption and broken switch fallthrough (#53)

Fix three issues from bad merge of gemini + codex adapters:
- Duplicate .requiredOption() calls on export and import commands
- case 'codex' placed after default: with no break (unknown formats
  fell through into codex handler)
- Broken indentation on gemini/codex case blocks

Fixes #53

Author: shreyas-lyzr

src/commands/export.ts

@@ -74,12 +74,12 @@ export const exportCommand = new Command('export')
         case 'gemini':
           result = exportToGeminiString(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');
+          break;
+        default:
+          error(`Unknown format: ${options.format}`);
+          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

@@ -548,12 +548,12 @@ export const importCommand = new Command('import')
         case 'gemini':
           importFromGemini(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');
+          break;
+        default:
+          error(`Unknown format: ${options.from}`);
+          info('Supported formats: claude, cursor, crewai, opencode, gemini, codex');
           process.exit(1);
       }