TempControllerBase: require PID gains via set_params(), not the constructor

Mirrors components/pid/pid.py's own Pid.set_params() pattern: params/
thresholds start out None, and set_params() configures pid_hold/pid_heat/
pid_cool from them. process()/process_fsm() fail naturally (TypeError on
None) if called before set_params() - same as Pid.process() already does -
rather than a new bespoke check. Updates all callers (server/brewpi.py,
SudForecastEstimator, and the pid/sud demo scripts) to call set_params()
right after construction.

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

components/pid/temp_controller_base.py

@@ -27,7 +27,7 @@ class States(enum.Enum):
 
 class TempControllerBase(APid):
 
-	def __init__(self, dt, params):
+	def __init__(self, dt):
 		APid.__init__(self)
 		self.pid_hold = Pid(dt)
 		self.pid_heat = Pid(dt)
@@ -44,13 +44,13 @@ class TempControllerBase(APid):
 		self.heatrate_soll = 1.0
 		self.theta_ist = 0
 		self.heatrate_ist = 0
-		self.params = params
-		self.thresholds = {**DEFAULT_THRESHOLDS, **params.get('Thresholds', {})}
+		# None until set_params() is called - mirrors Pid's own
+		# params/set_params() (components/pid/pid.py), whose process()
+		# already relies on the same "None means not configured yet".
+		self.params = None
+		self.thresholds = None
 		self.y = -1
 		self.state = States.INIT
-		self.pid_hold.set_params(params['Hold'])
-		self.pid_heat.set_params(params['Heat'])
-		self.pid_cool.set_params(params['Cool'])
 		self.is_startup = True
 		# Master on/off switch: while disabled, the FSM is held in IDLE and
 		# the controller tries not to drive the heater at all (output
@@ -58,6 +58,13 @@ class TempControllerBase(APid):
 		# (manual mode) or by SudTask for the duration of a run.
 		self.enabled = False
 
+	def set_params(self, params):
+		self.params = params
+		self.thresholds = {**DEFAULT_THRESHOLDS, **params.get('Thresholds', {})}
+		self.pid_hold.set_params(params['Hold'])
+		self.pid_heat.set_params(params['Heat'])
+		self.pid_cool.set_params(params['Cool'])
+
 	def on_state_entered(self, state):
 		pass