chore(vendor): import pi 0.85.1

Imported as a linear vendor commit so forge rebases do not replay the upstream root tree.

git-subtree-dir: third_party/pi

git-subtree-split: d981de1229ef899957bbe968bc8dcda02a21f477

third_party/pi/packages/coding-agent/test/suite/regressions/7731-tui-method-wrapping.test.ts

@@ -0,0 +1,31 @@
+import type { TUI } from "@earendil-works/pi-tui";
+import { describe, expect, it, vi } from "vitest";
+import { createInteractiveTuiReference } from "../../../src/modes/interactive/interactive-mode.ts";
+
+describe("TUI method wrapping", () => {
+	it("calls the method captured before a replacement", () => {
+		const renderer = {
+			render: (width: number) => [`width: ${width}`],
+		} as unknown as TUI;
+		const tui = createInteractiveTuiReference(() => renderer);
+		const originalRender = tui.render;
+		tui.render = (width: number) => originalRender(width);
+
+		expect(tui.render(80)).toEqual(["width: 80"]);
+	});
+
+	it("routes a captured method to a replacement renderer", () => {
+		const regularRequestRender = vi.fn();
+		const fullscreenRequestRender = vi.fn();
+		let renderer = { requestRender: regularRequestRender } as unknown as TUI;
+		const tui = createInteractiveTuiReference(() => renderer);
+		const requestRender = tui.requestRender;
+
+		requestRender();
+		renderer = { requestRender: fullscreenRequestRender } as unknown as TUI;
+		requestRender();
+
+		expect(regularRequestRender).toHaveBeenCalledOnce();
+		expect(fullscreenRequestRender).toHaveBeenCalledOnce();
+	});
+});