Simple shell script for backing up, restoring, and verifying the
encrypted SQLite database (AES-256-GCM with MVNC1\0 magic header).
Commands:
backup — cp + magic-verify to MAVEN_BACKUP_DIR
restore — cp back with confirmation prompt
verify — check magic header via od (no xxd/jq dependency)
list — show all backups with size and validity
Portable: uses only POSIX sh, od, grep, stat. Config path resolved
from mavend.json via grep or env var overrides.
kami