fix: refresh session cache TTL on hit to implement sliding window expiry

Author: cursoragent

workers/src/index.ts

@@ -1099,6 +1099,7 @@ export default {
       } else if (sessionId && sessionConsumerCache.has(sessionId)) {
         const cached = sessionConsumerCache.get(sessionId)!;
         if (Date.now() - cached.ts < SESSION_CONSUMER_TTL_MS) {
+          cached.ts = Date.now();
           consumerSource = cached.source;
         } else {
           sessionConsumerCache.delete(sessionId);