feat: add multi-session desktop workspace

test/agent-recovery.test.js

@@ -1,16 +1,25 @@
 import assert from "node:assert/strict";
-import { mkdir, mkdtemp } from "node:fs/promises";
+import { mkdir, mkdtemp, writeFile } from "node:fs/promises";
 import { tmpdir } from "node:os";
 import { join } from "node:path";
 import test from "node:test";
-import { createAgentRegistry } from "../src/bridge/agent-registry.js";
+import {
+	createAgentRegistry,
+	sessionDirectoryPath,
+} from "../src/bridge/agent-registry.js";
 
 test("recovers an exited agent with its last Pi session reference", async () => {
 	const root = await mkdtemp(join(tmpdir(), "pi-status-bridge-recovery-"));
 	const home = join(root, "home");
 	const sessionRoot = join(root, "sessions");
 	await mkdir(home);
-	const sessionFile = join(sessionRoot, "pi-session.jsonl");
+	const sessionDir = sessionDirectoryPath(sessionRoot, home);
+	await mkdir(sessionDir, { recursive: true });
+	const sessionFile = join(sessionDir, "pi-session.jsonl");
+	await writeFile(
+		sessionFile,
+		`${JSON.stringify({ type: "session", version: 3, id: "recovery", cwd: home })}\n`,
+	);
 	const calls = [];
 	const registry = createAgentRegistry({
 		homeWorktree: home,