Replace cheero with puppeteer

scripts/fetch_and_generate.ts

@@ -2,7 +2,7 @@ import crypto from "crypto";
 import fs from "fs/promises";
 import Parser from "rss-parser";
 import { config } from "../services/config.js";
-import { enhanceArticleContent } from "../services/content-extractor.js";
+import { enhanceArticleContent, closeBrowser } from "../services/content-extractor.js";
 import {
   getFeedById,
   getFeedByUrl,
@@ -425,6 +425,9 @@ async function processRetryQueue(abortSignal?: AbortSignal): Promise<void> {
         closeError,
       );
     }
+    
+    // Close Puppeteer browser on exit
+    await closeBrowser();
   }
 }