Extract shared factory dispatch into ComponentFactory base class

All four name-dispatch factories repeated the same if/elif lazy-import
pattern. Replace with a ComponentFactory base class holding a callable
registry and a _lazy() helper for the common import-and-construct case.
PlantFactory is an orchestrator, not a dispatcher, and is left as-is.

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

components/actor/heaterFactory.py

@@ -1,11 +1,8 @@
+from components.factory import ComponentFactory, _lazy
 
 
-class HeaterFactory:
-	@staticmethod
-	def create(name, *args, **kwargs):
-		if "sim" in name:
-			from components.actor.heater_sim import HeaterSim
-			return HeaterSim(*args, **kwargs)
-		elif "Hendi" in name:
-			from components.actor.heater_hendi import HeaterHendi
-			return HeaterHendi(*args, **kwargs)
+class HeaterFactory(ComponentFactory):
+    _registry = {
+        "sim":   _lazy("components.actor.heater_sim", "HeaterSim"),
+        "Hendi": _lazy("components.actor.heater_hendi", "HeaterHendi"),
+    }

components/actor/stirrerFactory.py

@@ -1,11 +1,13 @@
+from components.factory import ComponentFactory, _lazy
 
 
-class StirrerFactory:
-	@staticmethod
-	def create(name, dt, params):
-		if "sim" in name:
-			from components.actor.stirrersim import StirrerSim
-			return StirrerSim(dt)
-		elif "1376" in name:
-			from components.actor.stirrerpololu1376 import StirrerPololu1376
-			return StirrerPololu1376(dt, params)
+def _sim(dt, params):
+    from components.actor.stirrersim import StirrerSim
+    return StirrerSim(dt)
+
+
+class StirrerFactory(ComponentFactory):
+    _registry = {
+        "sim":  _sim,
+        "1376": _lazy("components.actor.stirrerpololu1376", "StirrerPololu1376"),
+    }