Add semantic constraint to all palette references and prompt template: color values are rendering guidance only and must not be displayed as text labels
Migrate from 4-dimension (Type×Style×Text×Mood) to 5-dimension (Type×Palette×Rendering×Text×Mood) system. 9 palettes × 6 renderings = 54 combinations replacing 20 fixed styles. Add style presets for backward compatibility, v2→v3 schema migration, and new reference structure (palettes/, renderings/, workflow/).