The updates currently hosted on this attunement (live-ref).
Plug an update into this host. The single consistency chokepoint: pushes onto the collection, sets the update's back-ref, and notifies command routing. Idempotent. Sealed.
Remove an update from this host. Retires its command contributions and — enforcing the must-be-hosted invariant — if the update is now hosted nowhere, destroys it. Returns whether it was hosted. Sealed.
Residual
AetherMixinsurface = attunement: the aether host (the hosted-update collection — see AetherHost) plus the ESP perception modalities (verbal-esp/emotive-esp, declared as the static_grantsModalities, not on this instance interface).Transmission moved out:
telland the DM cohort state now live onCommsMixin(the hosted comms update). Attunement = perceive the aether + host software; the comms update = transmit on it.