chore(vendor): import pi 0.85.1

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: d981de1229ef899957bbe968bc8dcda02a21f477

third_party/pi/scripts/package-workspaces.mjs

@@ -0,0 +1,24 @@
+import { existsSync, readdirSync } from "node:fs";
+import { join } from "node:path";
+
+const SKIPPED_DIRECTORIES = new Set(["dist", "node_modules"]);
+
+export function findPackageDirectories(root = "packages") {
+	const packageDirectories = [];
+
+	function visit(directory) {
+		if (existsSync(join(directory, "package.json"))) {
+			packageDirectories.push(directory);
+		}
+
+		for (const entry of readdirSync(directory, { withFileTypes: true })) {
+			if (!entry.isDirectory() || SKIPPED_DIRECTORIES.has(entry.name)) {
+				continue;
+			}
+			visit(join(directory, entry.name));
+		}
+	}
+
+	visit(root);
+	return packageDirectories.sort();
+}