pub const Q12_SIZING_STREAMS: usize = 8;Expand description
Streams assumed when provisioning scratch for the Q12 kernel-batched
prefill path. The per-stream metadata region scales with N, so the
scratch buffer must be sized for a realistic max concurrent batched
streams. Beyond this, check_kernel_batched_eligible falls the dispatch
back to the per-stream path (which respects the same arena cap), so this
bound only governs how often the fast path is available — never safety.