feat: add interactive ask-user extension

pi-ask-user/index.ts

@@ -0,0 +1,17 @@
+import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
+
+import { registerAskUserTool } from "./src/tool.ts";
+
+export default function askUserExtension(pi: ExtensionAPI): void {
+  registerAskUserTool(pi);
+}
+
+export { formatAnswers, normalizeQuestions, orderedAnswers } from "./src/normalize.ts";
+export type {
+  AskUserResult,
+  NormalizedQuestion,
+  QuestionInput,
+  QuestionOptionInput,
+  QuestionType,
+  UserAnswer,
+} from "./src/types.ts";