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/pack-packages.mjs

@@ -0,0 +1,48 @@
+#!/usr/bin/env node
+
+import { resolve } from "node:path";
+import { parseArgs } from "node:util";
+import { produceArtifactSet } from "./package-artifacts.mjs";
+
+function printUsage() {
+	console.log(`Usage: node scripts/pack-packages.mjs --out <dir> [options]
+
+Builds every public package and writes one coherent local artifact set.
+
+Options:
+  --out <dir>            Output directory; .artifacts/ is ignored by Git
+  --force                Replace an existing output directory
+  --offline-model-data   Build with already-hydrated model data
+  --skip-build           Pack existing build output without rebuilding
+  --help                 Show this help
+`);
+}
+
+const { values } = parseArgs({
+	options: {
+		force: { type: "boolean", default: false },
+		help: { type: "boolean", default: false },
+		"offline-model-data": { type: "boolean", default: false },
+		out: { type: "string" },
+		"skip-build": { type: "boolean", default: false },
+	},
+});
+if (values.help) {
+	printUsage();
+	process.exit(0);
+}
+if (!values.out) throw new Error("--out is required");
+
+const artifactSet = produceArtifactSet({
+	build: !values["skip-build"],
+	force: values.force,
+	offlineModelData: values["offline-model-data"],
+	outDir: values.out,
+	repoRoot: process.cwd(),
+});
+console.log(`\nLocal package artifacts created: ${artifactSet.artifactDirectory}`);
+console.log(`Manifest: ${artifactSet.manifestPath}`);
+console.log("\nConnect an external npm project with:");
+console.log(
+	`  node ${resolve("scripts/use-local-packages.mjs")} --manifest ${artifactSet.manifestPath} --consumer <project> --package <name>`,
+);