error response consistency, human readible1

packages/memory-service/src/index.js

@@ -80,7 +80,7 @@ app.patch('/sessions/by-external/:externalId', (req, res) => {
     const session = episodic.updateSessionByExternalId(req.params.externalId, {name, projectId });
     res.json(session);
   } catch (err) {
-    res.status(500).json({error: err.message });
+    res.status(500).json({ error: 'Failed to update session', detail: err.message });
   }
 });
 
@@ -235,7 +235,7 @@ app.post('/projects', (req, res) => {
   try {
     res.status(201).json(createProject({ name: name.trim(), description, colour, icon }));
   } catch (err) {
-    res.status(500).json({ error: err.message });
+    res.status(500).json({ error: 'Failed to create project', detail: err.message });
   }
 });
 
@@ -255,7 +255,7 @@ app.post('/projects/:id/summarize', async (req, res) => {
         if (err.message.includes('No session summaries or episodes')) {
             return res.status(422).json({ error: err.message });
         }
-        res.status(500).json({ error: err.message });
+        res.status(500).json({ error: 'Failed to generate project summary', detail: err.message });
     }
 });
 
@@ -310,7 +310,7 @@ app.post('/summaries', (req, res) => {
         const summary = createSummary({ sessionId, projectId, content, tokenCount, episodeRange, metadata });
         res.status(201).json(summary);
     } catch (err) {
-        res.status(500).json({ error: err.message });
+        res.status(500).json({ error: 'Failed to create summary', detail: err.message });
     }
 });