refactor(cli): split commands into modules

src/commands/help.ts

@@ -0,0 +1,23 @@
+import type { Command } from 'commander';
+import type { CliContext } from '../cli/shared.js';
+
+export function registerHelpCommand(program: Command, ctx: CliContext): void {
+  program
+    .command('help [command]')
+    .description('Show help for a command')
+    .action((commandName?: string) => {
+      if (!commandName) {
+        program.outputHelp();
+        return;
+      }
+
+      const cmd = program.commands.find((c) => c.name() === commandName);
+      if (!cmd) {
+        console.error(`${ctx.p('err')}Unknown command: ${commandName}`);
+        process.exitCode = 2;
+        return;
+      }
+
+      cmd.outputHelp();
+    });
+}