add Nodule Building

AGENTS.md

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+# Slimepire Project — Agent Rules
+
+## Before editing ANY file: ALWAYS re-read it first
+
+I often edit code manually while the agent is running. If you edit a file based on
+stale content from a previous read, you will overwrite my manual changes.
+
+**Rule:** Before calling `edit` or `write` on any existing file, read it again with
+`read` to get the current state. Never rely on file contents from earlier turns or
+from a previous compaction/context window.
+
+## Code style
+
+- Godot 4.7 C# project targeting .NET 10.0
+- Uses `GodotSharp.SourceGenerators` — provides `[Singleton]`, `[SceneTree]`,
+  `[ResourceTree]`, and `Instantiator.Instantiate<T>()`
+- Keep things simple, avoid over-engineering