docs: explain mixed-traffic instability

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diff --git a/REVIEW_SCORECARD.md b/REVIEW_SCORECARD.md
index bbc5bd3..035448f 100644
--- a/REVIEW_SCORECARD.md
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@@ -102,6 +102,7 @@ retroactively reopened by success on standard vision benchmarks.
 | 2026-07-22 / `2ef7f94` modified KP-2 | One clean full ResNet record reaches 91.26%, 0.36 points below matched BP, with 0.9994 early alignment, 0.9997 late feedback cosine, zero queries, and 1.326x BP MACs | 5 → 5 | Removes substrate stability as the immediate blocker and opens the load-bearing innovation experiment, but prior-art reciprocal plasticity earns no novelty credit |
 | 2026-07-22 / mixed-traffic MT-0 | Exact raw/matched/innovation mechanics pass; synthetic ResNet-20 matched batch peaks at 0.857 GB allocated on GTX 1080 without task data | 5 → 5 | Removes implementation, graph, and memory objections before endpoint access; supplies no evidence yet that innovation is useful |
 | 2026-07-22 / `f310ad5` mixed-traffic MT-1 | All three frozen conditions become nonfinite in epoch 1 and end at 10%; ratio calibration, predictor warmup, zero-query, and cost checks pass | 5 → 5 | Fails to make innovation load-bearing on a standard ResNet and closes MT-2/MT-3; the prior mechanism-only evidence survives but empirical support does not improve |
+| 2026-07-22 / `6531aed`, `d818fc2` MT-1 diagnosis | Training-only localization finds the first active failure at stem steps 23/69/74 for raw/matched/innovation; residual coupling yields the verified multiplicative operator `D W C` | 5 → 5 | Sharpens the failure into an operator-stability requirement and improves soundness of the negative analysis, but adds no successful held-out SDIL endpoint |
 
 Future rows are appended only after an audited frozen stage. A score staying flat is informative:
 engineering, theory exposition, or visualization may make the paper more defensible without