chore(vendor): import pi 1.3.0

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: 71023aec1546d6d677a65669c5665c0927ce0dd0

third_party/pi/scripts/npm-command.mjs

@@ -0,0 +1,10 @@
+import { execFileSync } from "node:child_process";
+import { existsSync } from "node:fs";
+
+export function execNpmSync(args, options = {}) {
+	if (process.platform !== "win32") return execFileSync("npm", args, options);
+	const npmCli = process.env.npm_execpath;
+	if (!npmCli) throw new Error("Cannot locate npm on Windows. Run this command through its npm script.");
+	if (!existsSync(npmCli)) throw new Error(`Cannot locate the npm CLI: ${npmCli}`);
+	return execFileSync(process.execPath, [npmCli, ...args], options);
+}