Dev vs Main Divergence Check.sh

echo "=== dev vs main divergence ==="; git rev-list --left-right --count origin/main...origin/dev; echo "(left=main-only, right=dev-only)"; echo; echo "=== commits in dev not in main (last 20) ==="; git log --oneline origin/main..origin/dev | head -20; echo; echo "=== commits in main not in dev ==="; git log --oneline origin/dev..origin/main | head -20; echo "(none above = main fully contained in dev)"