init: add source code from src.zip

src/commands/upgrade/index.ts

@@ -0,0 +1,16 @@
+import type { Command } from '../../commands.js'
+import { getSubscriptionType } from '../../utils/auth.js'
+import { isEnvTruthy } from '../../utils/envUtils.js'
+
+const upgrade = {
+  type: 'local-jsx',
+  name: 'upgrade',
+  description: 'Upgrade to Max for higher rate limits and more Opus',
+  availability: ['claude-ai'],
+  isEnabled: () =>
+    !isEnvTruthy(process.env.DISABLE_UPGRADE_COMMAND) &&
+    getSubscriptionType() !== 'enterprise',
+  load: () => import('./upgrade.js'),
+} satisfies Command
+
+export default upgrade