init: add source code from src.zip

src/commands/clear/clear.ts

@@ -0,0 +1,7 @@
+import type { LocalCommandCall } from '../../types/command.js'
+import { clearConversation } from './conversation.js'
+
+export const call: LocalCommandCall = async (_, context) => {
+  await clearConversation(context)
+  return { type: 'text', value: '' }
+}