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/packages/env/test/old-daemon.ts

@@ -0,0 +1,48 @@
+/**
+ * A stand-in for a daemon released before `hello.features`: it answers `hello` without `features` and refuses every
+ * other operation as an unknown one, as such a daemon refuses `listFiles`. Started as `node old-daemon.ts serve --token
+ * <hex>`.
+ */
+const token = process.argv[process.argv.indexOf("--token") + 1];
+process.stdout.write(`PI-ENV ${token}\n`);
+
+function send(type: number, id: number, json: Record<string, unknown>): void {
+	const body = Buffer.from(JSON.stringify(json), "utf8");
+	const header = Buffer.alloc(13);
+	header.writeUInt32BE(9 + body.length, 0);
+	header.writeUInt8(type, 4);
+	header.writeUInt32BE(id, 5);
+	header.writeUInt32BE(body.length, 9);
+	process.stdout.write(Buffer.concat([header, body]));
+}
+
+let buffered = Buffer.alloc(0);
+process.stdin.on("data", (chunk: Buffer) => {
+	buffered = Buffer.concat([buffered, chunk]);
+	while (buffered.length >= 4 && buffered.length >= 4 + buffered.readUInt32BE(0)) {
+		const length = buffered.readUInt32BE(0);
+		const type = buffered.readUInt8(4);
+		const id = buffered.readUInt32BE(5);
+		const jsonLength = buffered.readUInt32BE(9);
+		const json = JSON.parse(buffered.subarray(13, 13 + jsonLength).toString("utf8")) as { op?: string };
+		buffered = buffered.subarray(4 + length);
+		if (type !== 1) continue;
+		if (json.op === "hello") {
+			send(2, id, {
+				protocol: 1,
+				version: "1.1.0",
+				os: "linux",
+				arch: "x86_64",
+				home: "/",
+				separator: "/",
+				tmpdir: "/tmp",
+				cwd: "/",
+				driveCwds: {},
+				pid: process.pid,
+			});
+		} else {
+			send(3, id, { code: "EINVAL", message: `unknown operation ${json.op}` });
+		}
+	}
+});
+process.stdin.on("end", () => process.exit(0));