docs: propagate the 2.0 correction into 2.1 metadata and notes

The three ara-diac-small-2.1 metadata files quote the E4 result in
trained_from; the quoted 4.8218/42% figures were withdrawn on 2026-09-05
(RESULTS.md CORRECTION: corrected 2.0 number is 5.08, 38% reduction) -
now restated with the correction inline. PUBLICATION-NOTES lever table
and epoch sentence move to the corrected control; the E5 line keeps its
original measurement with the control correction noted. EXPERIMENTS:
the E4 verdict keeps its historical figure with the correction
annotation, and the GKD verdict line (written 2026-09-06, post-
correction, but still citing +1.18pp over 4.8218) restates the delta as
+1.43pp over the 4.5701 rung it was meant to improve. Metrics values
are untouched - only prose.

Author: Ronald Tse

docs/EXPERIMENTS.md

@@ -192,7 +192,7 @@ All rows passed the CER parity gate at release. Readings:
 
 ## E4 — ara-diac-small-2.0 candidate (run-006-r7-muon)
 
-- **Status:** COMPLETE (2026-08-29). **PASSED — 4.8218** full-set
+- **Status:** COMPLETE (2026-08-29). **PASSED — 4.8218** full-set [CORRECTED 2026-09-05: the figure did not reproduce; the corrected 2.0 number is 5.08 (38% reduction, not 42%)]
   windowed DER (gate ≤ 6.26; registered prediction 4.3–5.0; teacher r7
   reproduces 2.289 vs documented 2.2864). −3.44pp / 42% relative vs the
   shipped 1.0 at identical architecture and size; matches the PKM arm's
@@ -324,7 +324,7 @@ All rows passed the CER parity gate at release. Readings:
   (n=1200; teacher reproduces 2.289; paired bootstrap student−teacher
   +3.4083, CI [3.109, 3.743]). NOT ADOPTED. The registered prediction
   (4.30-4.65) missed badly; honest-report band also breached — this
-  is the worst rung measured, +1.18pp over the 4.8218 control. Run
+  is the worst rung measured, +1.43pp over the 4.5701 rung it was meant to improve (+0.92pp over the corrected 5.08 control; the pre-correction text said +1.18pp over 4.8218). Run
   run-012-r7-muon-gkd: 10,995 steps, final CE 0.0076, nine server
   preemptions absorbed by checkpoint-resume (no measured work lost);
   labels sha256 e70ce991d15a8c810b83e2b5401f1410293844c623ffefa646b

docs/PUBLICATION-NOTES.md

@@ -71,7 +71,7 @@ RL teacher polishing flat/negative ×3; microkimi bridges improve
 structure but not accuracy; teacher beam-search unnecessary for
 Arabic; per-channel int8 rejected on measurement; the 30 MiB tier
 closed as infeasible without pretraining; **E5 MTP-aux (2026-09-01):
-5.0853 vs the 4.8218 control — multi-token-prediction as a training
+5.0853 vs the control (then published 4.8218, corrected 2026-09-05 to 5.08) — multi-token-prediction as a training
 auxiliary HURT at this scale (+0.26pp), with a disclosed preemption
 confound (fresh aux head for the final 23% of steps); E6
 constant-budget register swap (2026-09-02): 5.8057 — replacing news
@@ -226,16 +226,17 @@ subset-inflation instances; the resume path now drops empty rows
 The E2/E3 factorial (3-epoch students) attributed the ~5.7pp gap as
 0.70pp capacity + 2.73pp optimizer + ~2.25pp residual "domain
 coverage." The 6-epoch rung (G2a) and the CI-carrying harness revise
-this: doubling epochs alone recovered 0.25pp full-set (4.8218 ->
-4.5701, CIs non-overlapping) — the residual was not purely domain.
+this: doubling epochs alone recovered 0.51pp full-set (corrected control
+5.08 -> 4.5701, CIs non-overlapping; the control's original 4.8218 was
+withdrawn 2026-09-05) — the residual was not purely domain.
 The decomposition for paper B, every line full-set with brackets:
 
 | lever | full-set DER | paired CI of delta |
 |---|---|---|
 | teacher r7 | 2.2864/2.2921 | — |
 | 1.0: AdamW, 3ep, r6 | 8.259 | retrofit in flight |
 | + Muon (E3) | 5.2945 | — |
-| + r7 teacher | 4.8218 | — |
+| + r7 teacher | 5.08 (corrected 2026-09-05; 4.8218 withdrawn) | — |
 | + 6 epochs (G2a) | 4.5701 | delta 2.12 [1.91, 2.35] |
 | register swap (E6, 3ep) | 5.8057 | negative |
 | register add (G2b, 6ep) | 4.8231 | delta 2.37 [2.19, 2.55] |

models/ara-diac-small-2.1/ara-diac-small-2.1-fp16.metadata.yaml

@@ -12,10 +12,11 @@ trained_from: 'sequence-level KD from the r7 canonical teacher (rababa_arabic_by
   2.2864 windowed DER-CE full protocol): fresh greedy r7 labels on the same r5-units
   corpus/limits as ara-diac-small-1.0, Muon optimizer (E3-adopted), vanilla ByT5-small
   (E4, pre-registered gate <= 6.26). Checkpoint rababa-checkpoints:/rababa_arabic_distill_small/run-007-r7-muon-6ep/best.
-  The two measured wins compound: 8.259 -> 4.8218 full-set windowed DER-CE (teacher
-  reproduces 2.289 in-run vs documented 2.2864) — a 42% error reduction on the 1.0
-  release at the same architecture and artifact size. Still misses the strict teacher+0.5pp
-  gate (+2.53pp; miss disclosed); the E2/E3 factorial attributes the residual to domain
+  The two measured wins compound: 8.259 -> 5.08 full-set windowed DER-CE (teacher
+  reproduces 2.289 in-run vs documented 2.2864) — a 38% error reduction on the 1.0
+  release at the same architecture and artifact size (CORRECTED 2026-09-05: the
+  published 4.8218 did not reproduce; see RESULTS.md). Still misses the strict
+  teacher+0.5pp gate (+2.79pp; miss disclosed); the E2/E3 factorial attributes the residual to domain
   coverage.'
 metrics:
 - name: der_teacher_fullset

models/ara-diac-small-2.1/ara-diac-small-2.1-int8.metadata.yaml

@@ -12,10 +12,11 @@ trained_from: 'sequence-level KD from the r7 canonical teacher (rababa_arabic_by
   2.2864 windowed DER-CE full protocol): fresh greedy r7 labels on the same r5-units
   corpus/limits as ara-diac-small-1.0, Muon optimizer (E3-adopted), vanilla ByT5-small
   (E4, pre-registered gate <= 6.26). Checkpoint rababa-checkpoints:/rababa_arabic_distill_small/run-007-r7-muon-6ep/best.
-  The two measured wins compound: 8.259 -> 4.8218 full-set windowed DER-CE (teacher
-  reproduces 2.289 in-run vs documented 2.2864) — a 42% error reduction on the 1.0
-  release at the same architecture and artifact size. Still misses the strict teacher+0.5pp
-  gate (+2.53pp; miss disclosed); the E2/E3 factorial attributes the residual to domain
+  The two measured wins compound: 8.259 -> 5.08 full-set windowed DER-CE (teacher
+  reproduces 2.289 in-run vs documented 2.2864) — a 38% error reduction on the 1.0
+  release at the same architecture and artifact size (CORRECTED 2026-09-05: the
+  published 4.8218 did not reproduce; see RESULTS.md). Still misses the strict
+  teacher+0.5pp gate (+2.79pp; miss disclosed); the E2/E3 factorial attributes the residual to domain
   coverage.'
 metrics:
 - name: der_teacher_fullset

models/ara-diac-small/ara-diac-small-2.1.metadata.yaml

@@ -12,10 +12,11 @@ trained_from: 'sequence-level KD from the r7 canonical teacher (rababa_arabic_by
   2.2864 windowed DER-CE full protocol): fresh greedy r7 labels on the same r5-units
   corpus/limits as ara-diac-small-1.0, Muon optimizer (E3-adopted), vanilla ByT5-small
   (E4, pre-registered gate <= 6.26). Checkpoint rababa-checkpoints:/rababa_arabic_distill_small/run-007-r7-muon-6ep/best.
-  The two measured wins compound: 8.259 -> 4.8218 full-set windowed DER-CE (teacher
-  reproduces 2.289 in-run vs documented 2.2864) — a 42% error reduction on the 1.0
-  release at the same architecture and artifact size. Still misses the strict teacher+0.5pp
-  gate (+2.53pp; miss disclosed); the E2/E3 factorial attributes the residual to domain
+  The two measured wins compound: 8.259 -> 5.08 full-set windowed DER-CE (teacher
+  reproduces 2.289 in-run vs documented 2.2864) — a 38% error reduction on the 1.0
+  release at the same architecture and artifact size (CORRECTED 2026-09-05: the
+  published 4.8218 did not reproduce; see RESULTS.md). Still misses the strict
+  teacher+0.5pp gate (+2.79pp; miss disclosed); the E2/E3 factorial attributes the residual to domain
   coverage.'
 metrics:
 - name: der_teacher_fullset