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/style-presets.md

@@ -1,36 +1,43 @@
 # Style Presets
 
-`--preset X` expands to a style + layout combination. Users can override either dimension.
+`--preset X` expands to a style + layout + optional palette combination. Users can override any dimension.
 
-| --preset | Style | Layout |
-|----------|-------|--------|
-| `knowledge-card` | `notion` | `dense` |
-| `checklist` | `notion` | `list` |
-| `concept-map` | `notion` | `mindmap` |
-| `swot` | `notion` | `quadrant` |
-| `tutorial` | `chalkboard` | `flow` |
-| `classroom` | `chalkboard` | `balanced` |
-| `study-guide` | `study-notes` | `dense` |
-| `cute-share` | `cute` | `balanced` |
-| `girly` | `cute` | `sparse` |
-| `cozy-story` | `warm` | `balanced` |
-| `product-review` | `fresh` | `comparison` |
-| `nature-flow` | `fresh` | `flow` |
-| `warning` | `bold` | `list` |
-| `versus` | `bold` | `comparison` |
-| `clean-quote` | `minimal` | `sparse` |
-| `pro-summary` | `minimal` | `balanced` |
-| `retro-ranking` | `retro` | `list` |
-| `throwback` | `retro` | `balanced` |
-| `pop-facts` | `pop` | `list` |
-| `hype` | `pop` | `sparse` |
-| `poster` | `screen-print` | `sparse` |
-| `editorial` | `screen-print` | `balanced` |
-| `cinematic` | `screen-print` | `comparison` |
+| --preset | Style | Layout | Palette |
+|----------|-------|--------|---------|
+| `knowledge-card` | `notion` | `dense` | |
+| `checklist` | `notion` | `list` | |
+| `concept-map` | `notion` | `mindmap` | |
+| `swot` | `notion` | `quadrant` | |
+| `tutorial` | `chalkboard` | `flow` | |
+| `classroom` | `chalkboard` | `balanced` | |
+| `study-guide` | `study-notes` | `dense` | |
+| `cute-share` | `cute` | `balanced` | |
+| `girly` | `cute` | `sparse` | |
+| `cozy-story` | `warm` | `balanced` | |
+| `product-review` | `fresh` | `comparison` | |
+| `nature-flow` | `fresh` | `flow` | |
+| `warning` | `bold` | `list` | |
+| `versus` | `bold` | `comparison` | |
+| `clean-quote` | `minimal` | `sparse` | |
+| `pro-summary` | `minimal` | `balanced` | |
+| `retro-ranking` | `retro` | `list` | |
+| `throwback` | `retro` | `balanced` | |
+| `pop-facts` | `pop` | `list` | |
+| `hype` | `pop` | `sparse` | |
+| `poster` | `screen-print` | `sparse` | |
+| `editorial` | `screen-print` | `balanced` | |
+| `cinematic` | `screen-print` | `comparison` | |
+| `hand-drawn-edu` | `sketch-notes` | `flow` | `macaron` |
+| `sketch-card` | `sketch-notes` | `dense` | `macaron` |
+| `sketch-summary` | `sketch-notes` | `balanced` | `macaron` |
+
+Empty Palette = use style's built-in colors (or style's `default_palette` if defined in frontmatter).
 
 ## Override Examples
 
 - `--preset knowledge-card --style chalkboard` = chalkboard style with dense layout
 - `--preset poster --layout quadrant` = screen-print style with quadrant layout
+- `--preset hand-drawn-edu --palette warm` = sketch-notes style with flow layout, warm palette instead of macaron
+- `--style notion --palette macaron` = notion rendering rules with macaron colors
 
-Explicit `--style`/`--layout` flags always override preset values.
+Explicit `--style`/`--layout`/`--palette` flags always override preset values.