Reconcile Pi prerequisites with the integrated runtime while holding admission

tests/runner-e2e/web-server-command.ts

@@ -21,3 +21,12 @@ export function runnerE2EWebServerCommand(repositoryRoot: string) {
 export function runnerE2ETypeScriptProcessArgs(repositoryRoot: string, entry: string, args: string[] = []) {
   return ["--import", path.join(repositoryRoot, "cli/node_modules/tsx/dist/loader.mjs"), entry, ...args];
 }
+
+// pnpm's generated playwright bin shim adds NODE_PATH, even when the caller
+// rejected ambient injection. The installed lane invokes the public JS bin
+// with the current Node directly, keeping the WebServer environment closed.
+export function runnerE2EPlaywrightInvocation(repositoryRoot: string, args: string[], installed: boolean) {
+  return installed
+    ? { command: process.execPath, args: [path.join(repositoryRoot, "node_modules/@playwright/test/cli.js"), ...args] }
+    : { command: "pnpm", args: ["exec", "playwright", ...args] };
+}