pub fn barrier_count() -> u64Expand description
Read the current value of BARRIER_COUNT.
Each memory_barrier() call that reaches the underlying
objc::msg_send![encoder, memoryBarrierWithScope:] site increments this
counter. Capture-mode no-ops and pre-encoder no-ops are excluded.
ADR-015 H4 hypothesis: ~440 barriers/token on the qwen35 decode hot
path (verify against this counter).