Matches the SMEM layout: float_e2m1_unpacksmem_t is 1 byte/element. L1→L2 handoff uses unpacked format (same byte count as FP8). No bandwidth savings at L1→L2 for v1 — can optimize later.
Matches the SMEM layout: float_e2m1_unpacksmem_t is 1 byte/element. L1→L2 handoff uses unpacked format (same byte count as FP8). No bandwidth savings at L1→L2 for v1 — can optimize later.