feat: ara-diac-small-2.0 — E4 landed at 4.8218 (8.26 → 4.82, 42% error reduction) - #84
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The E4 arm completed as pre-registered (gate ≤6.26, prediction 4.3-5.0): r7 canonical teacher labels + Muon on the vanilla ByT5-small scores 4.8218 full-set (teacher reproduces 2.289), superseding the run-005 rung (5.2945) this branch originally targeted — as its own metadata anticipated. 42% error reduction vs the shipped 1.0 at identical architecture and artifact size. Strict teacher+0.5pp gate still missed (+2.53pp), disclosed.
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What
ara-diac-small-2.0 — the client-tier upgrade, retargeted to the run E4 pre-registered.
Built on the branch's original run-005 target (5.2945) and updated when E4 landed better, exactly as the original metadata anticipated ("an r7-teacher re-distillation is in flight and expected to supersede"): run-006-r7-muon = 4.8218 full-set windowed DER (gate ≤6.26, registered prediction 4.3–5.0; teacher r7 reproduces 2.289 vs documented 2.2864).
ara-diac-small-2→ run-006 checkpoint.