fix: refresh pi dependency compatibility

Update Pi packages to 0.79.9 and align pi-ask with current TUI/RPC behavior.

- guard custom ask/settings flows to TUI mode with a clear non-TUI fallback

- reset config cache on extension reload so edited settings are picked up

- clean up remote ask flow listeners on session shutdown

- forward editor focus/invalidation and keep @ file autocomplete explicit

- document the non-TUI contract and cover the compatibility fixes with tests

tests/answer-commands.test.ts

@@ -0,0 +1,47 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+import { registerAnswerCommands } from "../src/answer-commands.ts";
+
+function registerCommands() {
+	const commands = new Map<
+		string,
+		{ handler: (args: string, ctx: any) => Promise<void> }
+	>();
+	registerAnswerCommands({
+		registerCommand(
+			name: string,
+			command: { handler: (args: string, ctx: any) => Promise<void> }
+		) {
+			commands.set(name, command);
+		},
+	} as never);
+	return commands;
+}
+
+test("answer commands do not open custom UI outside TUI mode", async () => {
+	const commands = registerCommands();
+	const notifications: Array<{ message: string; type: string }> = [];
+	let customOpened = false;
+	const ctx = {
+		mode: "rpc",
+		ui: {
+			custom() {
+				customOpened = true;
+			},
+			notify(message: string, type: string) {
+				notifications.push({ message, type });
+			},
+		},
+	};
+
+	await commands.get("answer")?.handler("", ctx);
+	await commands.get("answer:again")?.handler("", ctx);
+	await commands.get("ask:replay")?.handler("", ctx);
+
+	assert.equal(customOpened, false);
+	assert.deepEqual(notifications, [
+		{ message: "/answer requires interactive TUI mode.", type: "error" },
+		{ message: "Ask replay requires interactive TUI mode.", type: "error" },
+		{ message: "Ask replay requires interactive TUI mode.", type: "error" },
+	]);
+});