fix: properly handle empty args to ensure CLI exits with code 0

The issue was that showHelpOrError was being called even when args were
already handled by the early exit. Now we only call it when there are
invalid args, not when there are no args.

This fixes the CI test failures on Linux where empty args handling
differs from macOS.

Author: avivsinai

.claude/settings.local.json

@@ -218,7 +218,8 @@
       "Bash(git init:*)",
       "Bash(PROMPTCODE_TEST=1 promptcode cc --yes)",
       "Bash(PROMPTCODE_TEST=1 PROMPTCODE_MOCK_LLM=1 OPENAI_API_KEY=test-key ./dist/promptcode expert \"Test question\" --model gpt-5 --no-web-search --yes)",
-      "Bash(OPENAI_API_KEY=\"\" ./dist/promptcode expert \"Test question\" --model gpt-5 --estimate-cost)"
+      "Bash(OPENAI_API_KEY=\"\" ./dist/promptcode expert \"Test question\" --model gpt-5 --estimate-cost)",
+      "Bash(git describe:*)"
     ],
     "deny": [],
     "defaultMode": "acceptEdits",

packages/cli/src/index.ts

@@ -69,16 +69,10 @@ import { exitWithCode, EXIT_CODES } from './utils/exit-codes';
 
 
 /**
- * Show help when no valid command is provided
+ * Show error for invalid command usage
  */
 function showHelpOrError(args: string[]): void {
-  // If no args provided, show help
-  if (args.length === 0) {
-    program.outputHelp();
-    process.exit(0);  // Exit cleanly after showing help
-  }
-  
-  // Otherwise show error for invalid usage
+  // Show error for invalid usage
   console.error(chalk.red(`Error: Invalid usage. Please specify a command.\n`));
   console.error(chalk.yellow('Available commands:'));
   console.error(chalk.gray('  generate   - Generate a prompt from selected files'));
@@ -606,10 +600,10 @@ if (args.includes('--update')) {
 // After converting --command to command, check if we have a known subcommand
 const hasSubcommand = args.length > 0 && knownCommands.includes(args[0]);
 
-if (!hasSubcommand) {
-  // No valid command found or no args provided, show help or error
+if (!hasSubcommand && args.length > 0) {
+  // Invalid command found, show error
   showHelpOrError(args);
-} else {
+} else if (hasSubcommand) {
   // Start async update check - will show message at exit if update available
   startUpdateCheck();