Function mtp_accept_debug 

pub fn mtp_accept_debug() -> bool

ATLAS_MTP_ACCEPT_DEBUG (PRESENCE): per-BATCH-WIDTH acceptance telemetry.

The shipped K ladder gives k_drafts == 2 at n in [5, 8], and the existing positional counters (k4_record_positional) are gated on k_drafts == 3, so at the C=8 operating point NOTHING reported p1 — only the na histogram. This gate turns on a per-n line reporting p1, mean accepted and the derived tokens/step, which is the quantity the C=8 arithmetic is written in. Counters only (no D2H, no sync), but it logs per period, so keep it off in timed legs unless the leg IS the accept measurement.