fix: unique room names per session, JT_ROOM dispatch, dispatch-first prompt

- token_server: generate voice-{uuid8} room name per request so each
  browser session creates a fresh room and triggers agent dispatch
- token claim: add jobType JT_ROOM to roomConfig.agents
- livekit.yaml: revert empty_timeout to default (300s)
- agent.py: system prompt now mandates dispatch_task for all non-trivial
  tasks (not just research); removed inline web_search instructions;
  added tool_call logging in _ReasoningFallbackWrapper

web/token_server.py

@@ -47,7 +47,7 @@ def make_token(room_name: str, identity: str) -> str:
             "canPublishData": True,
         },
         "roomConfig": {
-            "agents": [{"agentName": AGENT_NAME}],
+            "agents": [{"agentName": AGENT_NAME, "jobType": "JT_ROOM"}],
         },
     }
     h = b64url(json.dumps(header).encode())
@@ -66,7 +66,8 @@ class Handler(BaseHTTPRequestHandler):
 
         length = int(self.headers.get("Content-Length", 0))
         body = json.loads(self.rfile.read(length) or b"{}")
-        room_name = "voice-room"
+        # Unique room per session so LiveKit dispatches the agent at creation.
+        room_name = f"voice-{uuid.uuid4().hex[:8]}"
         identity = body.get("identity") or f"user-{uuid.uuid4().hex[:8]}"
 
         token = make_token(room_name, identity)