unconst/Affine-5czsc2fc98-r499-sbsv5-offline-dpo-hialpha-midrank-lobeta-softctx-extrasteps-merged

R499 Offline-DPO merged SKIP_LOCAL_TKC p3220 (not a submission)

R499 marsplan Offline-DPO merged salvage (TTL insurance; not a submission)

initial commit