Card: controlled test — f16 MTP head is a wash (~0.83 both); mtpF16 redundant, use base

Card: f16-head warm acceptance ~0.85 sustained (cold 0.77 undersold it); not an underperformer

Card: honest f16-head result (did NOT beat 4-bit Qwopus-donor head; donor match > precision)

Card: document the f16-MTP-head variant (3 variants)

Add model card (lineage, functionally-verified status, block_count gotcha)