Overview
One system, named at the layer where it is doing its work.
The Rust substrate: identity, memory, sensorium, reflection and the surfaces through which an agent reaches the world.
The composition: declared distribution, session authority, packages and device profiles that make a sovereign body operable. ViewTop, speech and delivery are components it owns.
The default agent: one identity inhabiting those layers while the human remains the credential and final authority over self.
Memory without a body is easy to revoke. A device shell without a real session authority is easy to bypass. A package archive without a declared profile becomes another private script. Each layer closes a different hole; none replaces the others.