Fix Python 3.10+/websockets compatibility, add CLI args and .gitignore

- ws/message.py, ws/server/ws_server_multi_user.py: drop the loop= kwarg
  and replace asyncio.wait(coroutines) with asyncio.gather(), both of
  which were removed/forbidden in Python 3.10+.
- brewpi/requirements.txt: pin websockets==10.4, the latest version that
  still supports this code's serve()/handler API.
- config.json.sim: move Model to the top level and add the missing gain
  field so it matches the schema brewpi.py and config.json.templ expect.
- brewpi/brewpi.py: add -c/-m/-s/-d CLI args for selecting config/model
  files, simulation mode, and debug.
- .gitignore: exclude __pycache__, logs, the local config.json, and
  editor/venv directories.

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

brewpi/brewpi.py

@@ -11,8 +11,17 @@ from components.actor import HeaterFactory, StirrerFactory
 from tasks import TaskManager, TempSensorTask, HeaterTask, PotTask, TcTask, StirrerTask, TracerTask
 from tracer import Tracer
 
+import argparse as ap
+
 if __name__ == '__main__':
-	config = json.load(open("config.json"))
+	parser = ap.ArgumentParser()
+	parser.add_argument("-d", "--debug", action="store_true")
+	parser.add_argument("-c", "--config", default="config.json")
+	parser.add_argument("-m", "--model", default="model.json")
+	parser.add_argument("-s", "--sim", action="store_true")
+
+	args = parser.parse_args()
+	config = json.load(open(args.config))
 	dispatcher = MessageDispatcher()
 	server = WsServerMultiUser(listener=dispatcher)
 	taskmgr = TaskManager()

brewpi/requirements.txt

@@ -0,0 +1,5 @@
+numpy
+scipy
+matplotlib
+websockets==10.4
+dpath