Function set_marconi_min_tokens 

pub fn set_marconi_min_tokens(v: usize) -> bool

Marconi snapshot-restore threshold: the shipped default, and the setter spark serve uses to pin it from --marconi-min-tokens before anything reads it. Re-exported rather than making model::mtp_carry public — the rest of that module is internal. Pin the restore threshold from --marconi-min-tokens, before anything reads it.

★ WHY A SETTER AND NOT JUST THE ENV VAR. A KAT gate needs this value to be part of its RECORD, and only recipe keys reach a record — an env var cannot, so a run configured by ATLAS_MARCONI_MIN_TOKENS could not state that it had been. Issue #936 measured a sharded BFCL draw disagreeing with the same draw run whole on 12 of 995 samples through cross-request SSM snapshot reuse; setting this high closes the consumer side and takes that to 2. A configuration that fixes a correctness property is worthless if a record cannot say it was used.

First writer wins, and a later call is IGNORED rather than panicking: the value is a process-wide constant once anything has read it, and a serve startup that set it twice would otherwise abort a running server over a duplicate flag. Returns whether this call is the one that set it, so the caller can warn if it lost the race — which means something read the threshold before serve configured it, and the flag silently did nothing.