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/check-package-install.mjs

@@ -0,0 +1,22 @@
+#!/usr/bin/env node
+
+import { mkdtempSync, rmSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import { installConsumer, packageConsumerDirectoryName, smokeTestNpmConsumer } from "./local-package-install.mjs";
+import { produceArtifactSet } from "./package-artifacts.mjs";
+import { codingAgentName, smokeTestCodingAgent } from "./coding-agent-smoke.mjs";
+
+const root = mkdtempSync(join(tmpdir(), "pi-package-install-"));
+try {
+	const artifactSet = produceArtifactSet({ build: false, outDir: join(root, "artifacts"), repoRoot: process.cwd() });
+	for (const pkg of artifactSet.packages) {
+		const directory = join(root, "consumers", packageConsumerDirectoryName(pkg.name));
+		installConsumer({ artifactSet, directory, packageNames: [pkg.name] });
+		smokeTestNpmConsumer({ artifactSet, directory, packageName: pkg.name });
+		if (pkg.name === codingAgentName) smokeTestCodingAgent(directory);
+	}
+	console.log(`Verified ${artifactSet.packages.length} isolated package consumers.`);
+} finally {
+	rmSync(root, { force: true, recursive: true });
+}