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docs/mono-embedding.md

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+# Mono Embedding Setup
+
+This project uses Mono embedding for managed (C#) scripts.
+
+Expected layout (vendored):
+`src/ThirdParty/mono/`
+- `include/mono-2.0/`
+- `lib/` (or `lib64/`) with `mono-2.0-sgen` library
+- `etc/mono/` (config files)
+- `lib/mono/4.5/` (framework assemblies)
+
+You can override the runtime location at runtime with:
+`MODU_MONO_ROOT=/path/to/mono`
+
+Build notes:
+- The CMake cache variable `MONO_ROOT` controls where headers/libs are found.
+- Managed scripts target `netstandard2.0` and are built with `dotnet build`.