refinement fixes

packages/memory-service/src/index.js

@@ -156,6 +156,18 @@ app.get('/sessions/:id/episodes', (req, res) => {
   res.json(episodes);
 });
 
+// Aggregate episode stats for a session (count, total tokens, max id).
+// Used by summarization to check the token threshold cheaply.
+app.get('/sessions/:id/episode-stats', (req, res) => {
+  res.json(episodic.getSessionEpisodeStats(Number(req.params.id)));
+});
+
+// Episodes newer than :afterId, chronological — the un-summarized tail.
+app.get('/sessions/:id/episodes/since/:afterId', (req, res) => {
+  const episodes = episodic.getEpisodesSince(Number(req.params.id), Number(req.params.afterId));
+  res.json(episodes);
+});
+
 app.delete('/episodes/:id', (req, res) => {
   const id = Number(req.params.id);
   episodic.deleteEpisode(id);