Function executor_storage_u64_len 

pub const fn executor_storage_u64_len(sizing: ExecutorSizing) -> usize

Number of u64 words a backing must hold for a sizing-sized executor. u64 backing is 8-aligned, which covers every field (all align_of ≤ 8; asserted in tests), so the entry never hand-aligns. The macro emits [MaybeUninit<u64>; executor_storage_u64_len(sizing)].