chore(refactor): remove orphaned comment, add double-start guard to rate-limiter

extension/background.js

@@ -192,8 +192,6 @@ let forceSyncTimeout = null;
 let episodeLobby = null; // { expectedTitle, initiatorPeerId, readyPeers: [], createdAt }
 let episodeLobbyTimeout = null;
 
-// --- Episode Title Extraction (synced with content.js via episode-utils.js) ---
-
 // --- Storage Utils ---
 
 /**

server/rate-limiter.js

@@ -115,6 +115,7 @@ export function checkAdminMetricsAuthRate(ip) {
 }
 
 export function startRateLimitCleanup(io) {
+    if (authCleanupId !== null || rateLimitCleanupId !== null) return; // guard double-start
     // Clean up old auth failure records (every 15 minutes)
     authCleanupId = setInterval(() => {
         const now = Date.now();