First-boot script that configures a Parahub mesh node with zero user interaction: batman-adv BATMAN_V mesh, dual-band WiFi (private SAE + public open), firewall zones with guest isolation, SQM 128kbps shaping, MAC-derived subnets for collision avoidance, and key generation. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>