feat(ml): ledger gains the Arabic 2.0 rungs

ara-diac-2.0 (teacher): DER 2.2864 full-set windowed zero-skip; OOD
WikiNews-2024 multi-ref WER 17.3794/DER 11.8273 — full sweep over 1.0.
ara-diac-small-2.0 (client): DER 4.8218 — a 42% error reduction over
the 1.0 at identical architecture and artifact size (r7 teacher labels
+ Muon optimizer; pre-registered E4).

Author: ronaldtse

src/pages/ml.astro

@@ -2,6 +2,14 @@
 import Base from "../layouts/Base.astro"
 
 const serverModels = [
+  {
+    id: "ara-diac-2.0",
+    task: "diacritization",
+    pair: "Arabic → haraqat",
+    metric: "DER 2.29 · OOD WER 17.38",
+    artifact: "fp32 · 2.7 GiB · parts",
+    status: "releasing",
+  },
   {
     id: "khm-latn-1.0",
     task: "translit",
@@ -45,6 +53,14 @@ const serverModels = [
 ]
 
 const clientModels = [
+  {
+    id: "ara-diac-small-2.0",
+    task: "diacritization",
+    pair: "Arabic → haraqat",
+    metric: "DER 4.82 (1.0 was 8.26)",
+    artifact: "int8 · ~0.5 GiB",
+    status: "releasing",
+  },
   {
     id: "tha-g2p-small-1.0",
     task: "g2p",