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/adapters/x/index.ts

@@ -1,4 +1,5 @@
 import type { Adapter, AdapterLoginInfo } from "../types";
+import { exportCookies, restoreCookies, type CookieSidecarConfig } from "../../browser/cookie-sidecar";
 import { detectInteractionGate } from "../../browser/interaction-gates";
 import type { ExtractedDocument } from "../../extract/document";
 import { collectMediaFromDocument } from "../../media/markdown-media";
@@ -10,6 +11,16 @@ import { extractSingleTweetDocumentFromPayload } from "./single";
 import { extractThreadDocumentFromPayloads } from "./thread";
 import { loadFullXThread } from "./thread-loader";
 
+const cookieConfig: CookieSidecarConfig = {
+  urls: ["https://x.com/", "https://twitter.com/"],
+  filename: "x-session-cookies.json",
+  requiredCookieNames: ["auth_token", "ct0"],
+  filterCookie: (c) => {
+    const d = c.domain ?? "";
+    return d.endsWith("x.com") || d.endsWith("twitter.com");
+  },
+};
+
 function extractDocumentFromPayloads(
   payloads: unknown[],
   statusId: string,
@@ -49,6 +60,12 @@ export const xAdapter: Adapter = {
   async checkLogin(context) {
     return detectXLogin(context);
   },
+  async exportCookies(context, profileDir) {
+    return exportCookies(context.browser.targetSession, cookieConfig, profileDir);
+  },
+  async restoreCookies(context, profileDir) {
+    return restoreCookies(context.browser.targetSession, cookieConfig, profileDir);
+  },
   async process(context) {
     const statusId = extractStatusId(context.input.url);
     if (!statusId) {