Add empty Godot frontend shell

NuGet.config

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+    <packageSources>
+        <add key="GodotSharpLocal" value="..\Godot_v4.5.1-stable_mono_win64\GodotSharp\Tools\nupkgs" />
+    </packageSources>
+</configuration>

README.md

@@ -1,10 +1,11 @@
 # Reactor Maintenance
 
-C# WinUI 3 + Win2D level editor for the deterministic grid simulation described in `docs/design.md`.
+C# simulation with WinUI 3 + Win2D editor and an empty Godot frontend shell for the deterministic grid simulation described in `docs/design.md`.
 
 ## Projects
 
 - `src/ReactorMaintenance.Simulation`: UI-independent level model, editor operations, validation, forecasts, simulation turns, versioned JSON serialization, and deterministic balancing defaults.
+- `src/ReactorMaintenance.Godot`: empty Godot 4.5 .NET frontend project shell referencing the simulation core.
 - `src/ReactorMaintenance.Win2D`: Win2D editor app for authoring terrain, underground fuel/coolant/electricity networks, props, explicit leak access faces, door edges, reactor consumer bindings, rule events, surface hazards, robot start, loading/saving levels, ending turns, interacting with props, and activating a ready reactor.
 - `tests/ReactorMaintenance.Simulation.Tests`: unit tests for deterministic simulation behavior, validation, serialization, and editor operations.
 
@@ -19,6 +20,8 @@ C# WinUI 3 + Win2D level editor for the deterministic grid simulation described
 ## Commands
 
 ```powershell
+dotnet build src\ReactorMaintenance.Godot\ReactorMaintenance.Godot.csproj
+..\Godot_v4.5.1-stable_mono_win64\Godot_v4.5.1-stable_mono_win64_console.exe --headless --editor --quit --path src\ReactorMaintenance.Godot
 dotnet test tests\ReactorMaintenance.Simulation.Tests\ReactorMaintenance.Simulation.Tests.csproj
 dotnet build src\ReactorMaintenance.Win2D\ReactorMaintenance.Win2D.csproj -p:Platform=x64 -p:EnableWindowsTargeting=true
 dotnet run --project src\ReactorMaintenance.Win2D\ReactorMaintenance.Win2D.csproj -p:Platform=x64

ReactorMaintenance.slnx

@@ -1,5 +1,6 @@
 <Solution>
     <Folder Name="/src/">
+        <Project Path="src/ReactorMaintenance.Godot/ReactorMaintenance.Godot.csproj"/>
         <Project Path="src/ReactorMaintenance.Simulation/ReactorMaintenance.Simulation.csproj"/>
         <Project Path="src/ReactorMaintenance.Win2D/ReactorMaintenance.Win2D.csproj">
             <Platform Project="x86"/>

src/ReactorMaintenance.Godot/ReactorMaintenance.Godot.csproj

@@ -0,0 +1,13 @@
+<Project Sdk="Godot.NET.Sdk/4.5.1">
+    <PropertyGroup>
+        <TargetFramework>net8.0</TargetFramework>
+        <RootNamespace>ReactorMaintenance.Godot</RootNamespace>
+        <Nullable>enable</Nullable>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <EnableDynamicLoading>true</EnableDynamicLoading>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\ReactorMaintenance.Simulation\ReactorMaintenance.Simulation.csproj" />
+    </ItemGroup>
+</Project>

src/ReactorMaintenance.Godot/project.godot

@@ -0,0 +1,18 @@
+; Engine configuration file.
+; It is best edited using the Godot editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=5
+
+[application]
+
+config/name="Reactor Maintenance"
+config/features=PackedStringArray("4.5", "C#", "Forward Plus")
+
+[dotnet]
+
+project/assembly_name="ReactorMaintenance.Godot"

src/ReactorMaintenance.Simulation/ReactorMaintenance.Simulation.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFramework>net10.0</TargetFramework>
+        <TargetFramework>net8.0</TargetFramework>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>
     </PropertyGroup>

src/ReactorMaintenance.Win2D/ReactorMaintenance.Win2D.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
     <PropertyGroup>
         <OutputType>WinExe</OutputType>
-        <TargetFramework>net10.0-windows10.0.19041.0</TargetFramework>
+        <TargetFramework>net8.0-windows10.0.19041.0</TargetFramework>
         <TargetPlatformMinVersion>10.0.17763.0</TargetPlatformMinVersion>
         <RootNamespace>ReactorMaintenance.Win2D</RootNamespace>
         <ApplicationManifest>app.manifest</ApplicationManifest>

tests/ReactorMaintenance.Simulation.Tests/ReactorMaintenance.Simulation.Tests.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <TargetFramework>net10.0</TargetFramework>
+        <TargetFramework>net8.0</TargetFramework>
         <ImplicitUsings>enable</ImplicitUsings>
         <Nullable>enable</Nullable>