Require TempController(Smith)'s model params/ambient via setters; add comprehensive process() checks

TempController(Smith).__init__ no longer takes model_params/theta_amb -
set_model_plant_params() and the existing set_ambient_temperature() must be
called instead (mirrors components/plant/pot.py's own Pot constructor
refactor). temp_controller.py's now-pointless model_params/theta_amb
constructor placeholders (kept only for "compatibility" with Smith) are
dropped too.

Both TempController variants now raise a clear RuntimeError from process()
itself if set_params() wasn't called, instead of letting it surface deep
inside Pid.process() as an opaque "'NoneType' object is not subscriptable".
Smith additionally checks its internal models via Pot.is_configured() (new)
and raises if set_model_plant_params()/set_ambient_temperature() weren't
called either.

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

components/plant/pot.py

@@ -57,6 +57,14 @@ class Pot(APlant):
 	def initial(self, temp):
 		self.temp = temp
 
+	def is_configured(self):
+		"""Whether both set_plant_params() and set_ambient_temperature()
+		have been called - lets a caller driving this Pot as an internal
+		model (e.g. TempController(Smith)) check upfront and raise its
+		own comprehensive error, rather than letting process() fail on
+		whichever of the two happens to be missing."""
+		return self.delay is not None and self.theta_amb is not None
+
 	def activate(self, enable):
 		pass