Move set_on_changed registrations from on_process() to __init__()

Callbacks were registered inside the async on_process() coroutine,
meaning they weren't active until the event loop started ticking.
Moving them to __init__ ensures they're wired up at construction time.
Also removes remaining debug prints from the affected task files.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Tqxrk8uj4M3w3d3eXm3xK8

tasks/stirrer.py

@@ -11,6 +11,9 @@ class StirrerTask(ATask):
 		self.msg_handler = msg_handler
 		msg_handler.set_recv_handler(self.recv)
 		self.device = stirrer_device
+		stirrer_device.set_on_changed("speed", self.on_speed_changed)
+		stirrer_device.set_on_changed("dutyCycle", self.on_dutycycle_changed)
+		stirrer_device.set_on_changed("cycleTime", self.on_cycletime_changed)
 
 	def on_speed_changed(self, value):
 		asyncio.create_task(self.send({'Speed': value}))
@@ -30,11 +33,6 @@ class StirrerTask(ATask):
 		await self.msg_handler.send(data)
 
 	async def on_process(self):
-		print("{}: Started with interval {} s".format(self.msg_handler.get_key(), self.interval))
-		self.device.set_on_changed("speed", self.on_speed_changed)
-		self.device.set_on_changed("dutyCycle", self.on_dutycycle_changed)
-		self.device.set_on_changed("cycleTime", self.on_cycletime_changed)
-
 		self.device.set_speed(50.0)
 		self.device.set_cycle_time(10.0)
 		self.device.set_duty_cycle(1.0)