Function mtp_state_slots_with 

pub fn mtp_state_slots_with(
    max_batch_size: usize,
    spec_dispatch_cap: usize,
    full_width: bool,
) -> usize

Pure core of mtp_state_slots (env-free, unit-testable).

spec_dispatch_cap is speculative::mtp_max_seqs() — the scheduler never dispatches a speculative step wider than this. The floor VERIFY_WY_TABLE_SEQS (32) guarantees bs<=32 configs are untouched even under ATLAS_NO_MTP_K_LADDER (which drops the dispatch cap to 4).