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/src/cli/config-selector.ts

@@ -0,0 +1,61 @@
+/**
+ * TUI config selector for `pi config` command
+ */
+
+import { ProcessTerminal, type TUI, TuiMainScreen } from "@earendil-works/pi-tui";
+import type { SettingsManager } from "../core/settings-manager.ts";
+import { ConfigSelectorComponent, type ScopedResolvedPaths } from "../modes/interactive/components/config-selector.ts";
+import { initTheme, stopThemeWatcher } from "../modes/interactive/theme/theme.ts";
+
+export interface ConfigSelectorOptions {
+	resolvedPaths: ScopedResolvedPaths;
+	settingsManager: SettingsManager;
+	cwd: string;
+	agentDir: string;
+	writeScope: "global" | "project";
+	projectModeAvailable: boolean;
+}
+
+/** Show TUI config selector and return when closed */
+export async function selectConfig(options: ConfigSelectorOptions): Promise<void> {
+	// Initialize theme before showing TUI
+	initTheme(options.settingsManager.getTheme(), true);
+
+	return new Promise((resolve) => {
+		const ui: TUI = new TuiMainScreen(
+			new ProcessTerminal(),
+			options.settingsManager.getShowHardwareCursor(),
+			options.agentDir,
+		);
+		ui.setClearOnShrink(options.settingsManager.getClearOnShrink());
+		let resolved = false;
+
+		const selector = new ConfigSelectorComponent(
+			options.resolvedPaths,
+			options.settingsManager,
+			options.cwd,
+			options.agentDir,
+			() => {
+				if (!resolved) {
+					resolved = true;
+					ui.stop();
+					stopThemeWatcher();
+					resolve();
+				}
+			},
+			() => {
+				ui.stop();
+				stopThemeWatcher();
+				process.exit(0);
+			},
+			() => ui.requestRender(),
+			ui.terminal.rows,
+			options.writeScope,
+			options.projectModeAvailable,
+		);
+
+		ui.addChild(selector);
+		ui.setFocus(selector.getResourceList());
+		ui.start();
+	});
+}