Constant LAN_SIG_MAX_AGE_SECS 

const LAN_SIG_MAX_AGE_SECS: i64 = REAGENT_SIG_MAX_AGE_SECS; // 600i64

Anti-replay window for LAN lan_sig — reuses the WAN reasoning (REAGENT_SIG_MAX_AGE_SECS) rather than host-tier’s tighter JEKT_SIG_MAX_AGE_SECS: LAN crosses an actual network hop (mDNS discovery + an HTTP round trip through a peer instance), not a same-process call, so it needs the wider real-network-delivery-latency margin WAN already established rather than host-tier’s same-machine one.