Validation

README.md

@@ -120,6 +120,8 @@ Identical notation bodies share layout and body rasterization even when titles o
 
 Solos use one pooled model trained on the paired scores in `data/training`. Both solo slots contribute equally; there is no learned acoustic/electric style distinction. **Registered Solo 1 is played exactly by acoustic and Solo 2 exactly by electric.** Unregistered song/slot pairs use deterministic model prediction. Exact registered playback is explicit authored reuse, not a claim of model memorization. Only Autumn Leaves and All of Me are included initially.
 
+Training and playback use the same contextual harmony validator as predictions. It recognizes supported colors, passing notes, approaches and anticipations from the actual notes, durations and chords. No explanatory score labels or hand-authored justification tags are required. The four approved solos pass this validation; their explanatory labels have been removed without changing their music. Unsupported relationships still produce a diagnostic rather than silently changing a note.
+
 Add a source and its authored solo without changing generator code:
 
 ```sh