Per-scene key attribution diverged from the generation split whenever the
advisor rewrote prompt_to_encode away from the raw prompt, so
resolve_scene_refinement_keys hit its all-keys UNION fallback and assigned
every key to every scene. That union got persisted into the run and read
back at rating time, training every key on every clip (value_fn bloat).
- prompt_scene_shortcut_keys now scans both expanded and original text
(mirrors split_timeline_verbatim), so identical structure -> matching
scene count -> precise attribution far more often.
- Divergence fallback is now default-key only (empty sets), not the
all-keys union; a diverged run under-trains instead of cross-training.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
