Revert upstream pnpm switch; keep bun for the UI build

The merge auto-adopted upstream's pnpm switch (#1645) in tests/e2e/
global-setup.ts and ui/package.json, but our fork builds the UI with
bun (vercel.json + the E2E workflow's setup-bun). That left the
Playwright globalSetup running `corepack pnpm install --frozen-lockfile`
with no pnpm-lock.yaml, failing E2E at UI build time.

Revert global-setup.ts and ui/package.json to the dev (bun) baseline,
drop the merge-added ui/pnpm-lock.yaml, and remove the re-added
ui/AGENTS.md (our fork had deleted it).

tests/e2e/global-setup.ts

@@ -14,9 +14,9 @@ export default function globalSetup() {
   if (existsSync(shell) && !process.env.E2E_FORCE_UI_BUILD) return;
 
   if (!existsSync(resolve(ui, "node_modules"))) {
-    execSync("corepack pnpm install --frozen-lockfile", { cwd: ui, stdio: "inherit" });
+    execSync("bun install", { cwd: ui, stdio: "inherit" });
   }
-  execSync("corepack pnpm run build", {
+  execSync("bun run build", {
     cwd: ui,
     stdio: "inherit",
     env: { ...process.env, VITE_DASHBOARD_API_BASE_URL: `http://127.0.0.1:${port}` },

ui/AGENTS.md

@@ -1,12 +0,0 @@
-# AGENTS.md
-
-This file applies to all work under `ui/`.
-
-## Package manager
-
-- Use **pnpm** for dashboard dependency management and script execution.
-- Run UI scripts with `pnpm run <script>` (for example, `pnpm run typecheck`, `pnpm run lint`, `pnpm run test`, `pnpm run build`).
-- Install or update UI dependencies with `pnpm install` / `pnpm add` only.
-- Do **not** use npm in this directory: no `npm install`, `npm ci`, `npm run`, `npx`, or npm lockfile changes.
-- Do **not** use Bun in this directory: no `bun install`, `bun add`, `bun run`, `bunx`, or Bun lockfile changes.
-- If a command must use npm or Bun, it belongs outside `ui/` in a subtree that explicitly owns that package-manager configuration and lockfiles.

ui/README.md

@@ -7,7 +7,7 @@ This is a template for a new TanStack Start project with React, TypeScript, and
 To add components to your app, run the following command:
 
 ```bash
-pnpm dlx shadcn@latest add button
+npx shadcn@latest add button
 ```
 
 This will place the ui components in the `components` directory.

ui/package.json

@@ -1,11 +1,10 @@
 {
   "name": "open-swe-dashboard",
   "private": true,
-  "packageManager": "pnpm@11.9.0",
   "type": "module",
   "scripts": {
     "dev": "vite dev --port 3000",
-    "build": "node --max-old-space-size=4096 ./node_modules/vite/bin/vite.js build",
+    "build": "vite build",
     "preview": "vite preview",
     "test": "vitest run",
     "lint": "eslint",
@@ -56,7 +55,6 @@
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
     "@vitejs/plugin-react": "^5.2.0",
-    "httpxy": "0.5.3",
     "jsdom": "^27.4.0",
     "prettier": "^3.8.1",
     "prettier-plugin-tailwindcss": "^0.8.0",