Set up Cursor Cloud dev environment for the CyberVerse server

[nobody71004]

Summary

Sets up the development environment so the CyberVerse server can be built, run, and smoke-tested end-to-end in the Linux cloud environment. Adds AGENTS.md with durable, non-obvious setup/run instructions for future agents. No application code was changed.

Only the server is runnable here; the client/ is a Windows-only Cyberpunk 2077 game mod and cannot run in this environment.

What was installed (baked into the snapshot)

• .NET 9 SDK (~/.dotnet)
• vcpkg (~/vcpkg), ninja, build tooling
• gamenetworkingsockets + transitive deps built via vcpkg (x64-linux-dynamic triplet)
• Pointed the c++/cc alternatives at gcc/g++ (base image defaulted c++ to clang, which can't find libstdc++)

Update script (dependency refresh on startup)

git submodule update --init server/Native/deps/zpp_bits
[ -x "$HOME/.dotnet/dotnet" ] && "$HOME/.dotnet/dotnet" restore server/Managed/Cyberverse.Server.csproj || true

Hello-world verification

Built the native C++ lib + the .NET managed server, ran it (listening on UDP 1337), and connected a real GameNetworkingSockets client that authenticated and joined the world. Server logs confirmed:

Player NightCityRunner authenticated (connection ...). Total connected: 1
Player NightCityRunner joined the world at (100, 200, 300)

hello_world_demo.log

Non-obvious gotchas (see AGENTS.md)

• Must use gcc (not the default clang) for the vcpkg compiler-detection step.
• Must build vcpkg deps with the x64-linux-dynamic triplet — the default static triplet doesn't export the GameNetworkingSockets::GameNetworkingSockets CMake target the project expects.
• The native .so must be next to the managed output (or on LD_LIBRARY_PATH) for P/Invoke.
• No automated test suite / no headless client exists in the repo.

Testing

• ✅ cmake --build server/Native/build (native shared lib)
• ✅ dotnet build server/Managed -c Debug (managed server)
• ✅ Server runs and listens on UDP 1337; client authenticates + joins world end-to-end

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