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/pid/pid_factory.py

@@ -1,11 +1,8 @@
+from components.factory import ComponentFactory, _lazy
 
 
-class PidFactory:
-	@staticmethod
-	def create(name, *args, **kwargs):
-		if "Normal" in name:
-			from components.pid.temp_controller import TempController
-			return TempController(*args, **kwargs)
-		elif "Smith" in name:
-			from components.pid.temp_controller_smith import TempController
-			return TempController(*args, **kwargs)
+class PidFactory(ComponentFactory):
+    _registry = {
+        "Normal": _lazy("components.pid.temp_controller", "TempController"),
+        "Smith":  _lazy("components.pid.temp_controller_smith", "TempController"),
+    }