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

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

skills/baoyu-article-illustrator/references/palettes/macaron.md

@@ -24,6 +24,10 @@ Soft macaron pastel color blocks on warm cream
 
 Coral Red (#E8655A) for key data, warnings, and emphasis highlights. Use sparingly — one or two elements per illustration.
 
+## Semantic Constraint
+
+Soft pastel macaron color palette. Use block colors as rounded card backgrounds for distinct information sections. Accent coral red sparingly for emphasis on key terms only. 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-article-illustrator/references/palettes/mono-ink.md

@@ -22,6 +22,10 @@ Black ink on pure white with sparse semantic accent colors
 
 Use black ink for all structural elements — lines, text, figures. Accent colors appear only for semantic highlighting: coral red for risks/gaps/problems, muted teal for positive/solution/after-states, dusty lavender for neutral category tags. Total colored pixels must remain under 10% of canvas. Pale gray may back a subtle zone but must never dominate.
 
+## Semantic Constraint
+
+Black ink on white canvas. Accent colors for semantic highlighting only — total colored pixels under 10% of canvas. Do NOT render color names, hex codes, or role labels as visible text in the image.
+
 ## Compatible With
 
 - `ink-notes` (primary, default pairing)

skills/baoyu-article-illustrator/references/palettes/neon.md

@@ -24,6 +24,10 @@ Vibrant neon colors on dark backgrounds
 
 Hot Pink (#FF1493) for primary emphasis. High contrast neon-on-dark creates immediate visual impact.
 
+## Semantic Constraint
+
+Vibrant neon-on-dark palette. High contrast, immediate visual impact. Do NOT render color names, hex codes, or role labels as visible text in the image.
+
 ## Best For
 
 Gaming, retro tech, 80s/90s nostalgic content, bold editorial, trend and pop culture

skills/baoyu-article-illustrator/references/palettes/warm.md

@@ -23,6 +23,10 @@ Warm earth tones on soft peach, no cool colors
 
 Warm Orange (#ED8936) for primary emphasis. Warm-only palette — no cool colors (no green, blue, purple). Modern-retro feel.
 
+## Semantic Constraint
+
+Warm earth tone palette. Warm-only — no cool colors (no green, blue, purple). Do NOT render color names, hex codes, or role labels as visible text in the image.
+
 ## Best For
 
 Product showcases, team introductions, feature grids, brand content, personal growth, lifestyle