Identity forgetting without the original forget set: delete the prototype, then readapt on limited support
For identity-level unlearning when the full original forget set is unavailable at request time, MCU aggregates each training identity's features into prototypes held in an external memory, deletes the target prototype, and readapts on limited support information, trading off utility, membership distinguishability, and request-time compute on the 1-SHUI identity partitioning and one-shot support construction.