added chat history orchestration endpoint

packages/orchestration-service/src/services/memory.js

@@ -47,10 +47,20 @@ async function getEpisodeById(episodeId) {
     return res.json();
 }
 
+async function getSessionHistory(sessionId, limit = 20, offset = 0) {
+    const res = await fetch(
+        `${BASE_URL}/sessions/${sessionId}/episodes?limit=${limit}&offset=${offset}`
+    );
+    if (res.status === 404 ) return null;
+    if (!res.ok) throw new Error(`Failed to fetch history: ${res.status}`);
+    return res.json();
+}
+
 module.exports = {
     getSessionByExternalId,
     createSession,
     getRecentEpisodes,
     createEpisode,
-    getEpisodeById
+    getEpisodeById,
+    getSessionHistory
 }