fix grind package installation

scripts/bundle-sandbox-builtins.mjs

@@ -0,0 +1,53 @@
+import { mkdir } from "node:fs/promises";
+import path from "node:path";
+import { build } from "esbuild";
+
+const sourceRoot = process.env.PI_BUILTIN_EXTENSIONS_SRC
+  ? path.resolve(process.env.PI_BUILTIN_EXTENSIONS_SRC)
+  : path.resolve(process.cwd(), "packages");
+const outputRoot = process.env.PI_BUILTIN_EXTENSIONS_OUT
+  ? path.resolve(process.env.PI_BUILTIN_EXTENSIONS_OUT)
+  : path.resolve(process.cwd(), ".tmp/builtins");
+
+const entries = [
+  {
+    name: "pi-channels",
+    entry: path.join(sourceRoot, "pi-channels", "src", "index.ts"),
+  },
+  {
+    name: "pi-teams",
+    entry: path.join(sourceRoot, "pi-teams", "extensions", "index.ts"),
+  },
+  {
+    name: "pi-grind",
+    entry: path.join(sourceRoot, "pi-grind", "src", "index.ts"),
+  },
+];
+
+const external = [
+  "@mariozechner/pi-agent-core",
+  "@mariozechner/pi-ai",
+  "@mariozechner/pi-ai/oauth",
+  "@mariozechner/pi-coding-agent",
+  "@mariozechner/pi-tui",
+  "@sinclair/typebox",
+];
+
+await mkdir(outputRoot, { recursive: true });
+
+for (const { name, entry } of entries) {
+  const outdir = path.join(outputRoot, name);
+  await mkdir(outdir, { recursive: true });
+  await build({
+    entryPoints: [entry],
+    outfile: path.join(outdir, "index.js"),
+    bundle: true,
+    format: "esm",
+    platform: "node",
+    target: "node22",
+    sourcemap: false,
+    logLevel: "info",
+    external,
+  });
+  console.log(`Bundled ${name} -> ${path.join(outdir, "index.js")}`);
+}