Claim scorecard (sealed snapshot)

Numbers from sealed notebooks/public/results.json only — no live recompute. 6 ranked · 2 excluded (null quantized BPB).

Claim	Sealed evidence	Caveat
Current leader	`exp004_partial_rope_promo` @ 1.2949 quant val BPB, 2,463 steps	3× wallclock promotion of partial-RoPE winner — mostly more steps, not a new edit
Best 600 s ablation	`exp004_partial_rope_clean` @ 1.4032, 821 steps	Phase-1 screen; within noise of compiled ~1.40 baseline (baseline not in this snapshot)
Systems floor	`baseline` @ 2.0668, 251 steps (eager, ~2,397 ms/step)	Wallclock went to overhead, not learning
Medium-signal miss	`exp003_ema_clean` @ 1.4905, 815 steps	EMA needs late snapshots — short window, not a fair EMA verdict
Early-signal confound	`exp002_xsa4` @ 1.5135, 481 steps	Slow manual attention path; implementation drowned architecture signal

Δ vs leader is descriptive only. Unequal step counts mean this is lineage ordering, not a matched-budget A/B table.