This PR adds incoming GameMessage type validation in Network::RelayCommandsToCommandList to mirror the existing outgoing-direction check in GetCommandsFromCommandList, closing a potential exploit path where a remote peer could inject non-network message types. isTransferCommand is refactored into a cleaner static helper isMessageTypeWithinNetworkRange that operates on the enum value directly rather than a pointer, and a new getGameMessageType() accessor is added to NetGameCommandMsg to enable the pre-construction type check.

• Ingress validation (Network.cpp): The new check reads m_type via getGameMessageType() before calling constructGameMessage(), which avoids an unnecessary allocation for rejected messages and validates the raw deserialized enum value at the right boundary.
• Static helper refactor: isMessageTypeWithinNetworkRange drops the null-pointer branch (correct, since callers are now responsible for passing a valid Type value) and is marked static, removing the implicit this dependency.
• Compile-time gate: The incoming validation is wrapped in #if !RETAIL_COMPATIBLE_CRC, which defaults to 1 (disabled) — the anti-cheat check is inactive in standard community builds; this was already flagged in a prior review thread.

The change is safe to merge — it cannot regress existing behaviour because the new validation path is only active when RETAIL_COMPATIBLE_CRC is explicitly set to 0, which is a non-default configuration.

The fix's core goal — blocking incoming messages with out-of-range types — is guarded by #if RETAIL_COMPATIBLE_CRC and therefore inactive in every default build. The refactor to isMessageTypeWithinNetworkRange and the new getGameMessageType() accessor are both correct and safe; the concern is solely that the anti-cheat protection this PR was created to deliver does not fire in the builds most users will run.

Core/GameEngine/Source/GameNetwork/Network.cpp — the validation logic inside the #else branch deserves a second look once the project decides to lift the retail compatibility constraint.