Update runtime checks and installer behavior

src/pi/launch.ts

@@ -2,8 +2,11 @@ import { spawn } from "node:child_process";
 import { existsSync } from "node:fs";
 
 import { buildPiArgs, buildPiEnv, type PiRuntimeOptions, resolvePiPaths } from "./runtime.js";
+import { ensureSupportedNodeVersion } from "../system/node-version.js";
 
 export async function launchPiChat(options: PiRuntimeOptions): Promise<void> {
+	ensureSupportedNodeVersion();
+
 	const { piCliPath, promisePolyfillPath } = resolvePiPaths(options.appRoot);
 	if (!existsSync(piCliPath)) {
 		throw new Error(`Pi CLI not found: ${piCliPath}`);

src/pi/package-presets.ts

@@ -1,6 +1,7 @@
 import type { PackageSource } from "@mariozechner/pi-coding-agent";
 
 export const CORE_PACKAGE_SOURCES = [
+	"npm:@companion-ai/alpha-hub",
 	"npm:pi-subagents",
 	"npm:pi-btw",
 	"npm:pi-docparser",

src/pi/runtime.ts

@@ -79,7 +79,8 @@ export function buildPiEnv(options: PiRuntimeOptions): NodeJS.ProcessEnv {
 	const paths = resolvePiPaths(options.appRoot);
 
 	const currentPath = process.env.PATH ?? "";
-	const binPath = paths.nodeModulesBinPath;
+	const binEntries = [paths.nodeModulesBinPath, resolve(paths.piWorkspaceNodeModulesPath, ".bin")];
+	const binPath = binEntries.join(":");
 
 	return {
 		...process.env,