Remove TracerTask

Its brewpi.mat output had no consumer - the GUI never subscribed to the
'Tracer' channel, and SudLogTask's run-scoped JSON logs now cover the same
sensor/heater/tc data for actual analysis. Drop the task, its DT_TASK_TRACER
interval, and the wiring in server/brewpi.py.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DkkuG48uHFCGKe6dPSERFk

server/brewpi.py

@@ -13,7 +13,7 @@ from components.plant import Pot
 from components.actor import HeaterFactory, StirrerFactory
 from components.sud import Sud
 from components.sud_forecast import SudForecastEstimator
-from tasks import TaskManager, TempSensorTask, HeaterTask, PotTask, TcTask, StirrerTask, TracerTask, SudTask, SudLogTask
+from tasks import TaskManager, TempSensorTask, HeaterTask, PotTask, TcTask, StirrerTask, SudTask, SudLogTask
 
 import argparse as ap
 
@@ -67,7 +67,6 @@ if __name__ == '__main__':
 
 	DT = config['Controller']['dt']
 	DT_TASK = 1.0 / config['Controller']['sim_warp_factor']
-	DT_TASK_TRACER = DT_TASK / DT
 	theta_amb = config['ambient_temperature']
 	plant_sim = "sim" in config['Controller']['plant_name']
 
@@ -111,9 +110,6 @@ if __name__ == '__main__':
 	# tasks/sud_log.py.
 	taskmgr.add(SudLogTask(sud, tc, heater, heater_task, sud_task, DT_TASK))
 
-	# Tracer
-	taskmgr.add(TracerTask(sensor, heater, tc, DT_TASK_TRACER, dispatcher.msgio_get("Tracer")))
-
 	# Assign data flow
 	# Assign tc control value to heater
 	tc.set_on_changed("y", heater_task.actor)