D1A-E4B v0.5: Kev's skills back on top of v0.4 (hard 55->71, devtools 64->70); PR blast/severity trade-off in the card

v0.4: pull-request labeling round 2

v0.3: pull-request labeling (English and Japanese)

D1A-E4B v0.2 (hybrid): + Kev recipe stages + Japanese JGLUE + agent-factory/routing; calibrated T=1.95

D1A-E4B v0.1: two epochs at lr 5e-5 (dev acc 0.853 trained / 0.680 new sources)