v0.6.0: primary-link failover mode, peer-signaled primary, peer MTU display - scheduler.primary_link_mode: single-link failover with hard-Down immediate switching and margin/streak hysteresis to prevent flapping between close-scoring links. - scheduler.follow_peer_primary: one host signals its chosen primary link (by name) to its peer over the wire, so the peer can follow instead of running its own independent primary-selection config. - mlvpn-tui shows both sides' live tunnel MTU in the Session panel. - VersionInfoPayload's decode is now tolerant of shorter payloads from pre-0.6.0 peers, avoiding a silent blind spot during rolling upgrades.