Update to livekit-agents 1.4, add Python 3.14 support (#47)

* Update to livekit-agents 1.4, add Python 3.14 support

* Use explicit dispatch by default

Set agent_name="my-agent" on the rtc_session decorator so the
agent must be explicitly dispatched to a room rather than
auto-joining every new room. Update the taskfile template
substitution to match the new decorator-based pattern.

src/agent.py

@@ -57,7 +57,7 @@ def prewarm(proc: JobProcess):
 server.setup_fnc = prewarm
 
 
-@server.rtc_session()
+@server.rtc_session(agent_name="my-agent")
 async def my_agent(ctx: JobContext):
     # Logging setup
     # Add any other context you want in all log entries here