feat(baoyu-fetch): add X session cookie sidecar and graceful Chrome lifecycle

Add cookie sidecar to export/restore X session cookies across runs.
Implement graceful Browser.close via WebSocket before falling back to kill.
Auto-detect and clean stale Chrome profile lock artifacts on launch failure.
Wait for X session readiness (auth_token + ct0) before auto-continuing login flows.

packages/baoyu-fetch/src/__tests__/profile.test.ts

@@ -2,7 +2,12 @@ import { afterEach, describe, expect, test } from "bun:test";
 import fs from "node:fs";
 import path from "node:path";
 import os from "node:os";
-import { ensureChromeProfileDir, resolveChromeProfileDir } from "../browser/profile";
+import {
+  ensureChromeProfileDir,
+  hasChromeLockArtifacts,
+  resolveChromeProfileDir,
+  shouldRetryChromeLaunchRecovery,
+} from "../browser/profile";
 
 const originalProfile = process.env.BAOYU_CHROME_PROFILE_DIR;
 
@@ -47,3 +52,17 @@ describe("ensureChromeProfileDir", () => {
     }
   });
 });
+
+describe("stale lock recovery helpers", () => {
+  test("detects Chrome singleton lock artifacts", () => {
+    expect(hasChromeLockArtifacts(["Cookies", "SingletonLock"])).toBe(true);
+    expect(hasChromeLockArtifacts(["chrome.pid"])).toBe(true);
+    expect(hasChromeLockArtifacts(["Preferences", "Cookies"])).toBe(false);
+  });
+
+  test("only retries stale-lock recovery when no live owner exists", () => {
+    expect(shouldRetryChromeLaunchRecovery({ hasLockArtifacts: true, hasLiveOwner: false })).toBe(true);
+    expect(shouldRetryChromeLaunchRecovery({ hasLockArtifacts: true, hasLiveOwner: true })).toBe(false);
+    expect(shouldRetryChromeLaunchRecovery({ hasLockArtifacts: false, hasLiveOwner: false })).toBe(false);
+  });
+});