win_iso_build

fix: use regex instead of [xml] cast to avoid namespace parsing errors on GitHub runner

fix: use order-independent hash (sorted KB filenames) instead of git blob SHA for meta4 change detection

chore: remove cron schedule, keep workflow_dispatch only (triggered by Win_ISO_Patching_Scripts release)

fix: sync build schedule to 15min after patching (30 0,16,18,20,22 * * *)

fix: restore GH_TOKEN env for gh CLI, track deleted IDs to avoid 404 on cleanup