split actuators from energy storage

src/physcom/engine/constraint_resolver.py

@@ -191,7 +191,11 @@ class ConstraintResolver:
     def _check_unmet_requirements(
         self, all_deps: list[tuple[str, Dependency]], result: ConstraintResult
     ) -> None:
-        """Rule 5: Required condition not provided by any entity → conditional."""
+        """Rule 5: Required condition not provided by any entity → conditional.
+
+        Energy-category requirements (e.g. energy_form) are hard blocks —
+        you cannot power an actuator with an incompatible energy source.
+        """
         provides = {(d.key, d.value) for _, d in all_deps if d.constraint_type == "provides"}
         # Ambient conditions that don't need to be explicitly provided
         ambient = {
@@ -207,7 +211,11 @@ class ConstraintResolver:
                 continue  # Infrastructure is external, not checked here
             key_val = (dep.key, dep.value)
             if key_val not in provides and key_val not in ambient:
-                result.warnings.append(
+                msg = (
                     f"{name} requires {dep.key}={dep.value} "
                     f"but no entity in this combination provides it"
                 )
+                if dep.category == "energy":
+                    result.violations.append(msg)
+                else:
+                    result.warnings.append(msg)