* Add rendering policy with legacy preference migration and safe adapter selection
* Add rendering mode preferences and GPU fallback recovery warning
* Complete CPU fallback recovery and validate rendering mode UI
* Simplify GPU recovery and reuse preference persistence
* Rendering modes: rebase onto the preferences merge/retry save path; drop docs screenshots
save_preferences now writes through write_prefs (merging other instances' changes) and
only marks the revision saved when the write succeeds, so a failed recovery choice is
still retried. Removes a leftover diff3 marker in es.tsv, the docs/images/rendering-*.png
screenshots and their ATTRIBUTION row (no binary assets in the repo), and regenerates
docs/scorecard.md for the new performance.renderingMode preference.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---------
Co-authored-by: Brandon Thomas <echelon@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
