Failed Start Stream Request leaves server in `ERROR` state

[eliteprox]

An issue was introduced in PR 36 #36 which causes the pipeline state to revert to ERROR when a start stream request fails due to a stream already running. pyrickle

INFO:__main__:🔄 Model loading started...
INFO:__main__:Simulating model load for 15.0s...
INFO:pytrickle.server:Server started on 0.0.0.0:8000
INFO:aiohttp.access:172.18.0.8 [24/Nov/2025:16:48:36 -0500] "POST /stream/stop HTTP/1.1" 400 226 "-" "Go-http-client/1.1"
INFO:__main__:✅ Model loading complete in 15.00s
INFO:pytrickle.stream_processor:StreamProcessor 'model-loading-demo' model loaded successfully
INFO:pytrickle.stream_processor:Model loaded via parameter update for 'model-loading-demo'
ERROR:pytrickle.server:Error in start stream handler: Connection lost
ERROR:pytrickle.state:Stream state: ERROR - Stream start failed: Connection lost
ERROR:pytrickle.state:Error occurred from state IDLE, call stack:
ERROR:pytrickle.state:['  File "/home/elite/repos/pytrickle/.conda/lib/python3.11/site-packages/aiohttp/web_app.py", line 569, in _handle\n    return await handler(request)\n', '  File "/home/elite/repos/pytrickle/pytrickle/server.py", line 480, in _handle_start_stream\n    self.state.set_error(f"Stream start failed: {str(e)}")\n']
ERROR:pytrickle.state:State transition: IDLE → ERROR
INFO:aiohttp.access:172.18.0.8 [24/Nov/2025:16:48:38 -0500] "POST /stream/start HTTP/1.1" 400 0 "-" "Go-http-client/1.1"
WARNING:pytrickle.server:Stream start rejected - pipeline not ready yet
INFO:aiohttp.access:172.18.0.8 [24/Nov/2025:16:48:47 -0500] "POST /stream/start HTTP/1.1" 503 0 "-" "Go-http-client/1.1"

Prevents new stream from starting until server is restarted