Addresses all 4 open CVEs with specific implementations:
- CVE-2: Per-device WiFi password derived from serial/MAC + salt
- CVE-11: SSH key-only auth, ADACAM_PUBKEY injection at liberation
- CVE-14: adacam-api bearer token derived from device serial
- CVE-7/16: Kill usb-updater, no OTA for single-owner device
Also covers: firewall rules, tunnel security assessment,
data-at-rest recommendations, priority order for implementation.