Handle heat-sink loss and update turbine controls

src/reactor_sim/failures.py

@@ -56,7 +56,7 @@ class HealthMonitor:
             "primary_pump": ComponentHealth("primary_pump"),
             "secondary_pump": ComponentHealth("secondary_pump"),
         }
-        for idx in range(3):
+        for idx in range(2):
             name = f"turbine_{idx + 1}"
             self.components[name] = ComponentHealth(name)
         self.failure_log: list[str] = []