Calibre Creator Toolkit v1.9
Creative-quality update; C1USER01 schema1 and contract unchanged from v1.8.
New art-direction workflow, visual acceptance, stronger prompts, reusable
faceted hand library, showcase, material-aware illustrative desktop previews,
RGB565 preview source and independent exported-pack inspection.
Standard packs: Beta8+. Polygon metal materials: Beta8.0.5+.
Other optional extensions retain their contract.json firmware requirements.
Desktop shading is illustrative, not firmware-identical.
