Ensure dashboard quit saves state and ignore artifacts

.gitignore

@@ -1,3 +1,4 @@
 .venv/
 **/__pycache__/
 *.egg-info/
+artifacts/

artifacts/last_state.json

@@ -1,104 +0,0 @@
-{
-  "control": {
-    "setpoint_mw": 3000.0,
-    "rod_fraction": 0.3872181667930225
-  },
-  "plant": {
-    "core": {
-      "fuel_temperature": 633.2342060602825,
-      "neutron_flux": 31335131.43776027,
-      "reactivity_margin": 0.006241667151538859,
-      "power_output_mw": 2976.900110634399,
-      "burnup": 0.004945521266135161
-    },
-    "primary_loop": {
-      "temperature_in": 295.0,
-      "temperature_out": 338.7522062115579,
-      "pressure": 14.0,
-      "mass_flow_rate": 16200.0,
-      "steam_quality": 0.0
-    },
-    "secondary_loop": {
-      "temperature_in": 295.0,
-      "temperature_out": 360.05377003828596,
-      "pressure": 6.650537700382859,
-      "mass_flow_rate": 10880.0,
-      "steam_quality": 0.6505377003828593
-    },
-    "turbines": [
-      {
-        "steam_enthalpy": 3090.3226202297155,
-        "shaft_power_mw": 336.9056685758782,
-        "electrical_output_mw": 323.4294418328431,
-        "condenser_temperature": 305.0,
-        "load_demand_mw": 0.0,
-        "load_supplied_mw": 0.0
-      },
-      {
-        "steam_enthalpy": 3090.3226202297155,
-        "shaft_power_mw": 336.9056685758782,
-        "electrical_output_mw": 323.4294418328431,
-        "condenser_temperature": 305.0,
-        "load_demand_mw": 0.0,
-        "load_supplied_mw": 0.0
-      },
-      {
-        "steam_enthalpy": 3090.3226202297155,
-        "shaft_power_mw": 336.9056685758782,
-        "electrical_output_mw": 323.4294418328431,
-        "condenser_temperature": 305.0,
-        "load_demand_mw": 0.0,
-        "load_supplied_mw": 0.0
-      }
-    ],
-    "time_elapsed": 600.0
-  },
-  "metadata": {
-    "primary_pump_active": true,
-    "secondary_pump_active": true,
-    "turbine_active": true,
-    "turbine_units": [
-      true,
-      true,
-      true
-    ],
-    "shutdown": false,
-    "consumer": {
-      "online": false,
-      "demand_mw": 800.0,
-      "name": "Grid"
-    }
-  },
-  "health": {
-    "core": {
-      "name": "core",
-      "integrity": 0.9400000000000066,
-      "failed": false
-    },
-    "primary_pump": {
-      "name": "primary_pump",
-      "integrity": 0.5800000000000063,
-      "failed": false
-    },
-    "secondary_pump": {
-      "name": "secondary_pump",
-      "integrity": 0.1120000000000021,
-      "failed": false
-    },
-    "turbine_1": {
-      "name": "turbine_1",
-      "integrity": 0.610000000000003,
-      "failed": false
-    },
-    "turbine_2": {
-      "name": "turbine_2",
-      "integrity": 0.610000000000003,
-      "failed": false
-    },
-    "turbine_3": {
-      "name": "turbine_3",
-      "integrity": 0.610000000000003,
-      "failed": false
-    }
-  }
-}

src/reactor_sim/dashboard.py

@@ -94,6 +94,9 @@ class ReactorDashboard:
                         self._draw(stdscr, state)
                         self._handle_input(stdscr)
                         if self.quit_requested or self.reset_requested:
+                            # Persist the latest state if we are exiting early.
+                            if self.sim:
+                                self.sim.last_state = state
                             self.sim.stop()
                             break
                 finally: