Struct MeshNodeHandle 

pub struct MeshNodeHandle { /* private fields */ }

FFI handle for a MeshNode.

HandleGuard-protected: the box stays leaked across _free; ops register via try_enter and _free quiesces them via begin_free. Without this, an unconditional Box::from_raw would race concurrent net_mesh_send (and ~60 other entry points) into UAF on the dropped Box.

inner and channel_configs live in ManuallyDrop so _free can take them out after the drain. Other Arc clones held by surviving MeshStreamHandle._node keep MeshNode alive until those streams are also freed.