Add full traceback logging to Hermes route for diagnostics

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server.py

@@ -362,8 +362,10 @@ async def _fetch_hermes_token(endpoint: str) -> str:
     if cached:
         return cached
 
+    url = f"{endpoint}/"
+    log.info(f"[hermes] fetching token — GET {url!r} (len={len(url)}, bytes={url.encode()!r})")
     async with httpx.AsyncClient(timeout=10.0) as client:
-        resp = await client.get(f"{endpoint}/")
+        resp = await client.get(url)
         resp.raise_for_status()
         html = resp.text
 
@@ -575,7 +577,12 @@ async def agent_chat(req: ChatRequest, authorization: str = Header(default="")):
                 pose=valid_poses[0],
                 conversation_id=req.conversation_id,
             )
-        return await handle_hermes(req, agent, model, valid_poses)
+        try:
+            return await handle_hermes(req, agent, model, valid_poses)
+        except Exception as e:
+            import traceback
+            log.error(f"[hermes] unhandled exception:\n{traceback.format_exc()}")
+            raise
 
     # ── Route: Agent0 MCP ─────────────────────────────────────────────────────
     if agent.agent_type == "agent0" or (model and model.type == "agent0"):