refactor: replace SudLogTask with ServerLogTask for all logging

SudLogTask is removed; ServerLogTask now covers the full server session
and gains PlantParams tracking (log_plant_params callback wired from
SudTask.set_on_plant_params) so step transitions are still captured in
the log.

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

tasks/server_log.py

@@ -24,9 +24,13 @@ class ServerLogTask(ATask):
 		self.path = path
 		self.config = config
 		self._samples = []
+		self._param_events = []
 		self._t0 = time.monotonic()
 		self._run_id = time.strftime("%Y%m%dT%H%M%S", time.localtime())
 
+	def log_plant_params(self, elapsed, params):
+		self._param_events.append({'t': elapsed, 'params': params})
+
 	async def on_process(self):
 		while True:
 			power_set = max(self.heater_task.power_soll, self.heater_task.power_actor)
@@ -51,6 +55,8 @@ class ServerLogTask(ATask):
 		log_data = {'Name': ''}
 		if self.config is not None:
 			log_data['Config'] = self.config
+		if self._param_events:
+			log_data['PlantParams'] = self._param_events
 		log_data['Samples'] = self._samples
 		with open(path, 'w') as f:
 			json.dump(log_data, f, indent='\t')