4e88d1915f
- check-fork-drift.sh: compares each submodule HEAD against upstream/master, reports behind/ahead counts, exits 1 if any fork exceeds threshold - upgrade-forks.sh: fetches latest upstream, saves RB commits, resets to upstream, cherry-picks RB patches with conflict handling and backups - build-preflight.sh: wired drift check into preflight (threshold=50, suppressible via REDBEAR_SKIP_DRIFT_CHECK=1) - bootloader submodule pointer updated to latest upstream rebase