secubox-image.sh: Dev-side image builder via OpenWrt ASU API with
build, download, firmware-selector commands. Includes first-boot
script that resizes root, adds SecuBox feed, and installs all
packages. Supports --resize flag for full eMMC utilization.
secubox-sysupgrade.sh: On-device upgrade script that detects current
device/packages, builds custom image via ASU, and applies sysupgrade.
Uses jsonfilter (OpenWrt native) for JSON parsing.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
