feat(baoyu-xhs-images): add sketch-notes style, palette system, and new presets

- Restore baoyu-xhs-images as active skill (remove deprecated warning)
- Add sketch-notes style: hand-drawn educational infographic with macaron pastels
- Add palette system (macaron/warm/neon) as optional color override dimension
- Add 3 new presets: hand-drawn-edu, sketch-card, sketch-summary
- Add palette gallery documentation and palette override workflow
- Update style-presets.md with palette column
- Update prompt-assembly.md with palette override logic
- Update READMEs to reference baoyu-xhs-images

skills/baoyu-xhs-images/references/palettes/macaron.md

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+# Macaron Palette
+
+Soft pastel color blocks on warm cream background. Gentle, approachable, educational feel.
+
+## Background
+
+- Color: Warm cream (#F5F0E8)
+- Texture: Subtle paper grain, warm tone
+
+## Colors
+
+| Role | Color | Hex | Usage |
+|------|-------|-----|-------|
+| Background | Warm Cream | #F5F0E8 | Primary background |
+| Text | Deep Charcoal | #2C3E50 | Titles, main content |
+| Secondary Text | Warm Gray | #6B6B6B | Annotations, labels |
+| Block Color | Macaron Blue | #A8D8EA | Content block fill |
+| Block Color | Macaron Lavender | #D5C6E0 | Content block fill |
+| Block Color | Macaron Mint | #B5E5CF | Content block fill |
+| Block Color | Macaron Peach | #F8D5C4 | Content block fill |
+| Accent | Coral Red | #E8655A | Emphasis, highlights |
+
+## 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. All colors should feel gentle and approachable — no saturated or neon tones. Do NOT render color names or role labels as visible text in the image.
+
+## Best Paired With
+
+- `sketch-notes` — natural pairing for hand-drawn educational content
+- `notion` — macaron accents soften the monochrome aesthetic
+- `chalkboard` — pastel chalk tones replace standard chalk colors
+- `warm` — reinforces the cozy, friendly feel
+- `fresh` — complements the clean, natural aesthetic

skills/baoyu-xhs-images/references/palettes/neon.md

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+# Neon Palette
+
+Vibrant neon colors on dark background. High-energy, futuristic, eye-catching.
+
+## Background
+
+- Color: Dark Purple (#1A1025)
+- Texture: Smooth, deep
+
+## Colors
+
+| Role | Color | Hex | Usage |
+|------|-------|-----|-------|
+| Background | Dark Purple | #1A1025 | Primary background |
+| Text | Bright White | #F0F0F0 | Titles, main content |
+| Secondary Text | Light Lavender | #B8B8D4 | Annotations, labels |
+| Block Color | Neon Cyan | #00F5FF | Content block fill |
+| Block Color | Neon Magenta | #FF00FF | Content block fill |
+| Block Color | Neon Green | #39FF14 | Content block fill |
+| Block Color | Neon Pink | #FF6EC7 | Content block fill |
+| Accent | Electric Yellow | #FFFF00 | Emphasis, highlights |
+
+## Semantic Constraint
+
+Vibrant neon color palette on dark background. Colors should glow against the dark base. High contrast, futuristic feel. Use neon sparingly — too many glowing elements become chaotic. Let dark background breathe.
+
+## Best Paired With
+
+- `bold` — amplifies high-impact energy
+- `pop` — neon takes the vibrancy further
+- `minimal` — neon accents on dark create striking contrast
+- `notion` — futuristic knowledge card aesthetic

skills/baoyu-xhs-images/references/palettes/warm.md

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+# Warm Palette
+
+Warm earth tones on soft peach background. Cozy, inviting, no cool colors.
+
+## Background
+
+- Color: Soft Peach (#FFECD2)
+- Texture: Warm, slightly textured
+
+## Colors
+
+| Role | Color | Hex | Usage |
+|------|-------|-----|-------|
+| Background | Soft Peach | #FFECD2 | Primary background |
+| Text | Deep Brown | #744210 | Titles, main content |
+| Secondary Text | Warm Brown | #9C6644 | Annotations, labels |
+| Block Color | Warm Orange | #ED8936 | Content block fill |
+| Block Color | Terracotta | #C05621 | Content block fill |
+| Block Color | Golden Yellow | #F6AD55 | Content block fill |
+| Block Color | Dusty Rose | #D4A09A | Content block fill |
+| Accent | Burnt Sienna | #A0522D | Emphasis, highlights |
+
+## Semantic Constraint
+
+Warm-only color palette, no cool colors (no blue, green, purple). Earth tones throughout. Evokes comfort, warmth, and trust. All colors should feel like autumn sunlight.
+
+## Best Paired With
+
+- `warm` — natural pairing, amplifies cozy feel
+- `cute` — warm pastels enhance the sweet aesthetic
+- `retro` — earth tones complement vintage style
+- `sketch-notes` — warm educational feel