chore: add help message

src/commands/buildgraph/index.ts

@@ -5,4 +5,7 @@ import { run } from './run.ts'
 
 export const buildgraph = new Command<GlobalOptions>()
 	.description('buildgraph')
+	.action((function () {
+		this.showHelp()
+	}))
 	.command('run', run)

src/commands/debug/index.ts

@@ -5,4 +5,7 @@ import { debugConfig } from './debug-config.ts'
 
 export const debug = new Command<GlobalOptions>()
 	.description('debug')
+	.action((function () {
+		this.showHelp()
+	}))
 	.command('config', debugConfig)

src/commands/engine/index.ts

@@ -8,6 +8,9 @@ import { version } from './version.ts'
 
 export const engine = new Command<GlobalOptions>()
 	.description('engine')
+	.action((function () {
+		this.showHelp()
+	}))
 	.command('install', install)
 	.command('update', update)
 	.command('setup', setup)

src/commands/workflow/index.ts

@@ -5,4 +5,7 @@ import { exec } from './exec.ts'
 
 export const workflow = new Command<GlobalOptions>()
 	.description('workflow')
+	.action((function () {
+		this.showHelp()
+	}))
 	.command('exec', exec)