Function from_full_attention 

pub fn from_full_attention(
    spec: &FullAttentionSpec,
    names: &StageNames,
    target: &SpatialTarget,
) -> Result<Vec<SpatialProgram>, SpatialReject>

C = full attention(Q, K, V) over t positions and h heads — t query rows of h heads, each reading its own K/V head and attending over all t positions. Unmasked, as the vision tower’s block is: every row sees every position.