Entry1 v3-B (tier-5 free-option): attempt all context-fitting tiers; timeout rule protects completed tiers. Local tier90=5 overall=0.498 det; T5 decode 263s may exceed official 300s budget -> degrades to tier4

Entry1 v3-A2 (safe floor): cheap 2-point decode benchmark (load 57s->19s), budget-gated attempt policy drops T5; tier90=4 overall=0.40, det, 66s/300s

Entry1 v3-A (guaranteed floor): v3 trace model (T3/T4 100%), tier-0 diagnostic abstention, representative-depth attempt benchmark; tier90=4 overall=0.40 local, 65s/300s

Entry1 v1: T1-T2 full-coverage head + T3-T5 trace transformer (ckpt_prod3 step 316k)