fix(htm): set NON_PORTABLE_CLUSTER_SIZE_ALLOWED=1 for cluster_size=16

perf(htm): Hopper cluster::sync hardware barrier + sm_90a + cluster launch attr

perf(htm): DLB software grid barrier + non-cooperative launch (lifts 132-SM cap)

perf(htm): batched cooperative kernel — B=8 regions in ONE launch via blockIdx.y indexing

fix(htm_rust): remove software grid-barrier slow path

Update Feather H200 training runtime image