Kev-4B round 10: skills delta (hard-v1 + devtools-v1) on top of round 8

Kev-4B: real-document delta (round 8; documents-v1 locked test 0.804 -> 0.904)

Kev-4B: dates+unknowable delta on the v7 checkpoint (locked test 0.871 / 0.837); previous weights at tag v7-base

Kev-4B: Qwen3.5-4B-Base, decision-v7 recipe (locked test 0.870 / 0.832); previous Qwen3 weights at tag qwen3

kev-4b preview, decision-v7 recipe (transfer 0.790 dev / 0.806 locked; held-out pairs 0.73)

Research preview: Qwen3-4B-Base + LoRA r16, decision-v4, lr 5e-5 (trial lowdrift-4b-v4/01-trial-1); dev 0.843, transfer 0.759; locked test 0.852 / 0.794 (one ungated read)