fix(baoyu-cover-image): prevent color names and hex codes from appearing as visible text in images

Add semantic constraint to all palette references and prompt template:
color values are rendering guidance only and must not be displayed as text labels

skills/baoyu-cover-image/references/palettes/cool.md

@@ -21,6 +21,10 @@ Technical, professional, precise
 - Technical schematics and diagrams
 - Geometric precision elements
 
+## Semantic Constraint
+
+Do NOT render color names, hex codes, or role labels as visible text in the image.
+
 ## Best For
 
 Architecture, system design, API, technical documentation, engineering, data analysis

skills/baoyu-cover-image/references/palettes/dark.md

@@ -21,6 +21,10 @@ Cinematic, premium, atmospheric
 - Silhouettes with backlit edges
 - Subtle gradient backgrounds
 
+## Semantic Constraint
+
+Do NOT render color names, hex codes, or role labels as visible text in the image.
+
 ## Best For
 
 Entertainment, premium brands, cinematic storytelling, dark mode, gaming, night themes

skills/baoyu-cover-image/references/palettes/duotone.md

@@ -34,6 +34,10 @@ Choose ONE pair based on content mood. The two colors dominate the entire image:
 - Minimal use of third color (only for small highlights)
 - High contrast figure-ground relationships
 
+## Semantic Constraint
+
+Do NOT render color names, hex codes, or role labels as visible text in the image.
+
 ## Best For
 
 Movie posters, album covers, concert prints, dramatic announcements, cinematic content, bold branding, editorial covers, artistic campaigns

skills/baoyu-cover-image/references/palettes/earth.md

@@ -21,6 +21,10 @@ Natural, organic, grounded
 - Botanical illustrations
 - Earthy textures and natural patterns
 
+## Semantic Constraint
+
+Do NOT render color names, hex codes, or role labels as visible text in the image.
+
 ## Best For
 
 Nature, wellness, eco, organic, travel, sustainability, outdoor topics, slow living

skills/baoyu-cover-image/references/palettes/elegant.md

@@ -21,6 +21,10 @@ Sophisticated, refined, understated luxury
 - Refined geometric patterns
 - Balanced, symmetrical compositions
 
+## Semantic Constraint
+
+Do NOT render color names, hex codes, or role labels as visible text in the image.
+
 ## Best For
 
 Business, professional, thought leadership, luxury, corporate communications

skills/baoyu-cover-image/references/palettes/macaron.md

@@ -21,6 +21,10 @@ Soft macaron pastel color blocks on warm cream
 - Soft shadows, no hard edges
 - Gentle gradient transitions between zones
 
+## Semantic Constraint
+
+Do NOT render color names, hex codes, or role labels as visible text in the image.
+
 ## Best For
 
 Educational content, knowledge sharing, concept explainers, tutorials, tech summaries, onboarding materials

skills/baoyu-cover-image/references/palettes/mono.md

@@ -21,6 +21,10 @@ Clean, focused, essential
 - Single focal point emphasis
 - Stark contrast between elements
 
+## Semantic Constraint
+
+Do NOT render color names, hex codes, or role labels as visible text in the image.
+
 ## Best For
 
 Zen, focus, essential concepts, pure, simple, minimalist philosophy, clean design

skills/baoyu-cover-image/references/palettes/pastel.md

@@ -21,6 +21,10 @@ Gentle, whimsical, soft
 - Soft shadows and gentle highlights
 - Storybook-style elements
 
+## Semantic Constraint
+
+Do NOT render color names, hex codes, or role labels as visible text in the image.
+
 ## Best For
 
 Fantasy, children, gentle content, creative, whimsical, casual, beginner guides

skills/baoyu-cover-image/references/palettes/retro.md

@@ -25,6 +25,10 @@ Nostalgic, vintage, classic
 - Pill-shaped clouds, small dots and stars
 - Classic icons and retro motifs
 
+## Semantic Constraint
+
+Do NOT render color names, hex codes, or role labels as visible text in the image.
+
 ## Best For
 
 History, vintage, retro, classic, exploration, retrospectives, throwback content, creative proposals, educational

skills/baoyu-cover-image/references/palettes/vivid.md

@@ -21,6 +21,10 @@ Energetic, bold, attention-grabbing
 - Dramatic lighting effects
 - High-energy visual compositions
 
+## Semantic Constraint
+
+Do NOT render color names, hex codes, or role labels as visible text in the image.
+
 ## Best For
 
 Product launch, gaming, promotion, event, marketing, announcements, brand showcases

skills/baoyu-cover-image/references/palettes/warm.md

@@ -21,6 +21,10 @@ Friendly, approachable, human-centered
 - Hearts, smiling faces, friendly icons
 - Warm gradient overlays
 
+## Semantic Constraint
+
+Do NOT render color names, hex codes, or role labels as visible text in the image.
+
 ## Best For
 
 Personal growth, lifestyle, education, human stories, emotion, community

skills/baoyu-cover-image/references/workflow/prompt-template.md

@@ -62,6 +62,7 @@ Visual composition:
 - Decorative: [palette-specific elements that reinforce content theme]
 
 Color scheme: [primary, background, accent from palette definition, adjusted by mood]
+Color constraint: Color values (#hex) and color names are rendering guidance only — do NOT display color names, hex codes, or palette labels as visible text in the image.
 Rendering notes: [key characteristics from rendering definition — lines, texture, depth, element style]
 Type notes: [key characteristics from type definition]
 Palette notes: [key characteristics from palette definition]