Content-addressed shard DHT on seeder agents with subnet_primary_seeder election, cross-subnet fleet_torrent_gossip, BGP swarm magnets, C2 torrent manifest, and k-of-n peer fetch with C2 fallback.
Winning spread trees now persist StrainCard JSON and operators can apply strain/persona presets via POST /api/v1/fleet/play-strain-card with audit logging.