[CLI] Readable commands help message (#2927)

## Motivation for the change, related issues

Formats Playground CLI commands vertically in the CLI help message:

<img width="2178" height="1174" alt="CleanShot 2025-11-21 at 17 11
18@2x"
src="https://github.com/user-attachments/assets/d84a35ef-e0a6-4c34-b5bb-a066af26716a"
/>

Before this PR, they were aligned to the right and easy to miss:

<img width="2172" height="710" alt="CleanShot 2025-11-21 at 17 12 03@2x"
src="https://github.com/user-attachments/assets/5152d424-c8ec-45a4-8ac5-1c0fc3f31145"
/>

Technically, we use yargs `.command()` instead of `.positional()`.

cc @wojtekn

Author: adamziel

packages/playground/cli/src/run-cli.ts

@@ -88,11 +88,17 @@ export async function parseOptionsAndRunCLI(argsToParse: string[]) {
 		 */
 		const yargsObject = yargs(argsToParse)
 			.usage('Usage: wp-playground <command> [options]')
-			.positional('command', {
-				describe: 'Command to run',
-				choices: ['server', 'run-blueprint', 'build-snapshot'] as const,
-				demandOption: true,
-			})
+			.command('server', 'Start a local WordPress server')
+			.command(
+				'run-blueprint',
+				'Execute a Blueprint without starting a server'
+			)
+			.command(
+				'build-snapshot',
+				'Build a ZIP snapshot of a WordPress site based on a Blueprint'
+			)
+			.demandCommand(1, 'Please specify a command')
+			.strictCommands()
 			.option('outfile', {
 				describe: 'When building, write to this output file.',
 				type: 'string',
@@ -288,6 +294,18 @@ export async function parseOptionsAndRunCLI(argsToParse: string[]) {
 				hidden: true,
 			})
 			.showHelpOnFail(false)
+			.fail((msg, err, yargsInstance) => {
+				if (err) {
+					throw err;
+				}
+				if (msg && msg.includes('Please specify a command')) {
+					yargsInstance.showHelp();
+					console.error('\n' + msg);
+					process.exit(1);
+				}
+				console.error(msg);
+				process.exit(1);
+			})
 			.strictOptions()
 			.check(async (args) => {
 				if (args['skip-wordpress-install'] === true) {