Tested on actual sandbox environment. Fixes:
1. Add ACCEPT_FSL_EULA=1 (CRITICAL - build blocks without it)
2. Add --runall=fetch option (no full build needed for mirror)
3. Remove misleading tqma6qdl-multi-mba6x alternative (wrong board!)
4. Move premirror config to air-gapped section (not during fetch!)
5. Replace placeholder license script with actual bitbake -e method
6. Add Debian 12/13 compatibility note
7. Add verification table with actual test results
All steps verified on 2026-03-01 sandbox environment.
df7e003842