Create ar_differentiation_bed.py

bench table + honest verdict: KL gains do not convert on wikitext; ~-.02 task acc both arms, mechanism differences survive as the result

adopt-0 standardized bench

observer card: the adoption question, contribution ledger, distillation verdict, sign census; bench table lands on completion

adopt-0 standardized bench

adopt-0 verdict artifacts (both arms + results)

adopt-0 verdict artifacts (both arms + results)

adopt-0 verdict artifacts (both arms + results)

initial commit