feat(a2a): Godot 4.7 .NET project scaffold referencing Age.Engine (headless smoke)

SMOKE: Paths resolves to age-reimpl inside Godot; Age.Engine parses SC0000 in-process.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

godot/Himegari.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Godot.NET.Sdk/4.7.0">
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <EnableDynamicLoading>true</EnableDynamicLoading>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\engine\Age.Engine\Age.Engine.csproj" />
+  </ItemGroup>
+</Project>

godot/Main.cs

@@ -0,0 +1,14 @@
+using Godot;
+using Age.Engine.Sys4;
+
+public partial class Main : Godot.Control
+{
+    public override void _Ready()
+    {
+        var table = OpcodeTableJson.Load(Paths.OpcodesJson);
+        var script = Sys4Loader.Load(Paths.Scripts()["SC0000.BIN"], table);
+        GD.Print($"SMOKE repo={Paths.Repo}");
+        GD.Print($"SMOKE SC0000 instrs={script.Instructions.Count} strings={script.Strings.Count}");
+        GetTree().Quit(0);
+    }
+}

godot/Main.cs.uid

@@ -0,0 +1 @@
+uid://bsb43xig6d3r5

godot/Main.tscn

@@ -0,0 +1,8 @@
+[gd_scene load_steps=2 format=3]
+
+[ext_resource type="Script" path="res://Main.cs" id="1"]
+
+[node name="Main" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+script = ExtResource("1")

godot/project.godot

@@ -0,0 +1,8 @@
+config_version=5
+
+[application]
+config/name="Himegari (age-reimpl A2a)"
+run/main_scene="res://Main.tscn"
+
+[dotnet]
+project/assembly_name="Himegari"