rlmesh_remote_vector_env_shutdown
Env construction connects; Model construction only validates. Remote I/O is exclusive, while immutable accessors/cancellation may overlap any call. Accessor pointers remain borrowed until free, including after close.
RLMeshStatus rlmesh_remote_vector_env_shutdown(
RLMeshRemoteVectorEnv* remote_vector_env,
const char* reason,
bool* out_accepted
)