feat(baoyu-cover-image): add font dimension with 4 styles

Add 6th dimension for typography control:
- clean: modern geometric sans-serif
- handwritten: warm hand-lettered style
- serif: classic elegant typography
- display: bold decorative headlines

Includes auto-selection rules, compatibility matrix, and warm-flat preset.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

skills/baoyu-cover-image/SKILL.md

@@ -50,6 +50,7 @@ Generate elegant cover images for articles with 5-dimensional customization.
 | `--style <name>` | Preset shorthand (expands to palette + rendering, see [Style Presets](references/style-presets.md)) |
 | `--text <level>` | Text density: none, title-only, title-subtitle, text-rich |
 | `--mood <level>` | Emotional intensity: subtle, balanced, bold |
+| `--font <name>` | Font style: clean, handwritten, serif, display |
 | `--aspect <ratio>` | 16:9 (default), 2.35:1, 4:3, 3:2, 1:1, 3:4 |
 | `--lang <code>` | Title language (en, zh, ja, etc.) |
 | `--no-title` | Alias for `--text none` |
@@ -65,6 +66,7 @@ Generate elegant cover images for articles with 5-dimensional customization.
 | **Rendering** | Line quality, texture, depth, element style | flat-vector, hand-drawn, painterly, digital, pixel, chalk | auto |
 | **Text** | Text density, information hierarchy | none, title-only, title-subtitle, text-rich | title-only |
 | **Mood** | Emotional intensity, visual weight | subtle, balanced, bold | balanced |
+| **Font** | Typography style, character feel | clean, handwritten, serif, display | clean |
 
 Dimensions can be freely combined. Auto-selection rules: [references/auto-selection.md](references/auto-selection.md)
 
@@ -127,6 +129,17 @@ Rendering definitions: [references/renderings/](references/renderings/)
 
 Full guides: [references/dimensions/text.md](references/dimensions/text.md) | [references/dimensions/mood.md](references/dimensions/mood.md)
 
+## Font Gallery
+
+| Font | Description | Best For |
+|------|-------------|----------|
+| `clean` | Modern geometric sans-serif | Tech, professional, minimal |
+| `handwritten` | Warm hand-lettered style | Personal, friendly, lifestyle |
+| `serif` | Classic elegant typography | Editorial, academic, luxury |
+| `display` | Bold decorative headlines | Announcements, entertainment |
+
+Full guide: [references/dimensions/font.md](references/dimensions/font.md)
+
 ## Style Presets & Compatibility
 
 - **Style Presets**: `--style X` expands to palette + rendering. See [references/style-presets.md](references/style-presets.md)
@@ -175,7 +188,7 @@ Cover Image Progress:
     - [ ] File path given → saved to refs/ ✓
     - [ ] No path → asked user OR extracted verbally
   - [ ] 1.2 Output directory determined
-- [ ] Step 2: Confirm options (5 dimensions) ⚠️ REQUIRED unless --quick or all specified
+- [ ] Step 2: Confirm options (6 dimensions) ⚠️ REQUIRED unless --quick or all specified
 - [ ] Step 3: Create prompt
   - [ ] References in prompt ONLY if files exist in refs/
   - [ ] Extracted style/palette appended to prompt body (if no file)
@@ -196,7 +209,7 @@ Input → [Step 0: Preferences] ─┬─ Found → Continue
                                                                                       │
         ┌───────────────────────────────────────────────────────────────────────────┘
         ↓
-Analyze + Save Refs → [Output Dir ⚠️] → [Confirm: 5 Dimensions] → Prompt → Generate → Complete
+Analyze + Save Refs → [Output Dir ⚠️] → [Confirm: 6 Dimensions] → Prompt → Generate → Complete
                                                  ↓
                                         (skip if --quick or all specified)
 ```
@@ -233,7 +246,7 @@ Preferences loaded from [project/user]:
 • Quick mode: [enabled/disabled] | Language: [value or "auto"]
 ```
 
-**EXTEND.md Supports**: Watermark | Preferred type | Preferred palette | Preferred rendering | Preferred text | Preferred mood | Default aspect ratio | Default output directory | Quick mode | Custom palette definitions | Language preference
+**EXTEND.md Supports**: Watermark | Preferred type | Preferred palette | Preferred rendering | Preferred text | Preferred mood | Preferred font | Default aspect ratio | Default output directory | Quick mode | Custom palette definitions | Language preference
 
 Schema: [references/config/preferences-schema.md](references/config/preferences-schema.md)
 
@@ -326,14 +339,14 @@ For each reference image:
 
 ### Step 2: Confirm Options ⚠️
 
-Validate all 5 dimensions + aspect ratio. Full confirmation flow: [references/workflow/confirm-options.md](references/workflow/confirm-options.md)
+Validate all 6 dimensions + aspect ratio. Full confirmation flow: [references/workflow/confirm-options.md](references/workflow/confirm-options.md)
 
 **Skip Conditions**:
 
 | Condition | Skipped | Still Asked |
 |-----------|---------|-------------|
-| `--quick` or `quick_mode: true` | 5 dimensions | Aspect ratio (unless `--aspect`) |
+| `--quick` or `quick_mode: true` | 6 dimensions | Aspect ratio (unless `--aspect`) |
-| All 5 + `--aspect` specified | All | None |
+| All 6 + `--aspect` specified | All | None |
 
 ### Step 3: Create Prompt
 
@@ -431,7 +444,7 @@ Cover Generated!
 
 Topic: [topic]
 Type: [type] | Palette: [palette] | Rendering: [rendering]
-Text: [text] | Mood: [mood] | Aspect: [ratio]
+Text: [text] | Mood: [mood] | Font: [font] | Aspect: [ratio]
 Title: [title text or "visual only"]
 Language: [lang] | Watermark: [enabled/disabled]
 References: [N images (direct/style/palette) or "extracted style" or "none"]
@@ -463,7 +476,7 @@ All modifications automatically backup existing `cover.png` before regenerating.
 - Cover must be readable at small preview sizes
 - Visual metaphors > literal representations
 - Title: readable, impactful
-- Two confirmation points: Step 0 (first-time setup) + Step 2 (options) - skip Step 2 with `--quick`
+- Two confirmation points: Step 0 (first-time setup) + Step 2 (6 dimensions) - skip Step 2 with `--quick`
 - Use confirmed language for title text
 - Maintain watermark consistency if enabled
 - Check compatibility matrices when selecting combinations
@@ -485,7 +498,7 @@ All modifications automatically backup existing `cover.png` before regenerating.
 
 ## References
 
-**Dimensions**: [text.md](references/dimensions/text.md) | [mood.md](references/dimensions/mood.md)
+**Dimensions**: [text.md](references/dimensions/text.md) | [mood.md](references/dimensions/mood.md) | [font.md](references/dimensions/font.md)
 **Palettes**: [references/palettes/](references/palettes/)
 **Renderings**: [references/renderings/](references/renderings/)
 **Auto-Selection**: [references/auto-selection.md](references/auto-selection.md)

skills/baoyu-cover-image/references/auto-selection.md

@@ -58,3 +58,14 @@ Default: `title-only`
 | Launch, announcement, promotion, event, gaming, entertainment | `bold` |
 
 Default: `balanced`
+
+## Auto Font Selection
+
+| Signals | Font |
+|---------|------|
+| Personal, lifestyle, human, warm, friendly, story | `handwritten` |
+| Technical, professional, clean, modern, minimal, data | `clean` |
+| Editorial, academic, luxury, classic, literary | `serif` |
+| Announcement, entertainment, promotion, bold, event, gaming | `display` |
+
+Default: `clean`

skills/baoyu-cover-image/references/compatibility.md

@@ -48,3 +48,12 @@
 | metaphor | ✓✓ | ✓✓ | ✓ |
 | scene | ✓✓ | ✓✓ | ✓ |
 | minimal | ✓✓ | ✓✓ | ✗ |
+
+## Font × Rendering
+
+| | flat-vector | hand-drawn | painterly | digital | pixel | chalk |
+|---|:---:|:---:|:---:|:---:|:---:|:---:|
+| clean | ✓✓ | ✗ | ✗ | ✓✓ | ✓ | ✗ |
+| handwritten | ✓ | ✓✓ | ✓✓ | ✓ | ✗ | ✓✓ |
+| serif | ✓ | ✗ | ✓ | ✓✓ | ✗ | ✗ |
+| display | ✓✓ | ✓ | ✓ | ✓✓ | ✓✓ | ✓ |

skills/baoyu-cover-image/references/dimensions/font.md

@@ -0,0 +1,163 @@
+---
+name: font-dimension
+description: Typography style dimension for cover images
+---
+
+# Font Dimension
+
+Controls typography style and character feel.
+
+## Values
+
+| Font | Visual Style | Line Quality | Character |
+|------|--------------|--------------|-----------|
+| `clean` | Geometric sans-serif | Sharp, uniform | Modern, precise, neutral |
+| `handwritten` | Hand-lettered, brush | Organic, varied | Warm, personal, friendly |
+| `serif` | Classic serifs, elegant | Refined, structured | Editorial, authoritative |
+| `display` | Bold, decorative | Heavy, expressive | Attention-grabbing, playful |
+
+## Detail
+
+### clean
+
+Modern, universal typography with neutral character.
+
+**Characteristics**:
+- Geometric sans-serif letterforms
+- Sharp, uniform line weight
+- Clean edges, no flourishes
+- High readability at all sizes
+- Minimal personality, maximum clarity
+
+**Use Cases**:
+- Technical documentation
+- Professional/corporate content
+- Minimal design approaches
+- Data-driven articles
+- Modern brand aesthetics
+
+**Prompt Hints**:
+- Use clean geometric sans-serif typography
+- Modern, minimal letterforms
+- Sharp edges, uniform stroke weight
+- High contrast against background
+
+### handwritten
+
+Warm, organic typography with personal character.
+
+**Characteristics**:
+- Hand-lettered or brush style
+- Organic, varied line weight
+- Natural imperfections
+- Approachable, human feel
+- Casual yet intentional
+
+**Use Cases**:
+- Personal stories
+- Lifestyle content
+- Wellness and self-improvement
+- Creative tutorials
+- Friendly brand voices
+
+**Prompt Hints**:
+- Use warm hand-lettered typography with organic brush strokes
+- Friendly, personal feel
+- Natural variation in stroke weight
+- Approachable, human character
+
+### serif
+
+Classic, elegant typography with editorial authority.
+
+**Characteristics**:
+- Traditional serif letterforms
+- Refined, structured strokes
+- Elegant proportions
+- Timeless sophistication
+- Formal, trustworthy feel
+
+**Use Cases**:
+- Editorial content
+- Academic articles
+- Luxury brand content
+- Historical topics
+- Literary pieces
+
+**Prompt Hints**:
+- Use elegant serif typography with refined letterforms
+- Classic, editorial character
+- Structured, proportional spacing
+- Authoritative, sophisticated feel
+
+### display
+
+Bold, decorative typography for maximum impact.
+
+**Characteristics**:
+- Heavy, expressive letterforms
+- Decorative elements
+- Strong visual presence
+- Playful or dramatic character
+- Designed for headlines
+
+**Use Cases**:
+- Announcements
+- Entertainment content
+- Promotional materials
+- Event marketing
+- Gaming topics
+
+**Prompt Hints**:
+- Use bold decorative display typography
+- Heavy, expressive headlines
+- Strong visual impact
+- Attention-grabbing character
+
+## Default
+
+`clean` — Universal, pairs well with most rendering styles.
+
+## Rendering Compatibility
+
+| Font × Rendering | flat-vector | hand-drawn | painterly | digital | pixel | chalk |
+|------------------|:-----------:|:----------:|:---------:|:-------:|:-----:|:-----:|
+| clean | ✓✓ | ✗ | ✗ | ✓✓ | ✓ | ✗ |
+| handwritten | ✓ | ✓✓ | ✓✓ | ✓ | ✗ | ✓✓ |
+| serif | ✓ | ✗ | ✓ | ✓✓ | ✗ | ✗ |
+| display | ✓✓ | ✓ | ✓ | ✓✓ | ✓✓ | ✓ |
+
+✓✓ = highly recommended | ✓ = compatible | ✗ = not recommended
+
+## Type Compatibility
+
+| Font × Type | hero | conceptual | typography | metaphor | scene | minimal |
+|-------------|:----:|:----------:|:----------:|:--------:|:-----:|:-------:|
+| clean | ✓ | ✓✓ | ✓✓ | ✓ | ✗ | ✓✓ |
+| handwritten | ✓✓ | ✓ | ✓ | ✓✓ | ✓✓ | ✓ |
+| serif | ✓ | ✓ | ✓✓ | ✓ | ✓ | ✓ |
+| display | ✓✓ | ✓ | ✓✓ | ✓ | ✓ | ✗ |
+
+## Palette Interaction
+
+Font style adapts to palette characteristics:
+
+| Palette Category | clean | handwritten | serif | display |
+|------------------|-------|-------------|-------|---------|
+| Warm (warm, earth, pastel) | Softer weight | Natural fit | Warm tones | Playful energy |
+| Cool (cool, mono, elegant) | Perfect match | Contrast | Classic pairing | Bold statement |
+| Dark (dark, vivid) | High contrast | Glow effects | Dramatic | Maximum impact |
+| Vintage (retro) | Modern contrast | Nostalgic fit | Period-appropriate | Retro headlines |
+
+## Auto Selection
+
+When `--font` is omitted, select based on signals:
+
+| Signals | Font |
+|---------|------|
+| Personal, lifestyle, human, warm, friendly, story | `handwritten` |
+| Technical, professional, clean, modern, minimal, data | `clean` |
+| Editorial, academic, luxury, classic, literary | `serif` |
+| Announcement, entertainment, promotion, bold, event, gaming | `display` |
+
+Default: `clean`

skills/baoyu-cover-image/references/style-presets.md

@@ -22,6 +22,7 @@
 | `vector-illustration` | `retro` | `flat-vector` |
 | `vintage` | `retro` | `hand-drawn` |
 | `warm` | `warm` | `hand-drawn` |
+| `warm-flat` | `warm` | `flat-vector` |
 | `watercolor` | `earth` | `painterly` |
 
 ## Override Examples

skills/baoyu-cover-image/references/workflow/confirm-options.md

@@ -2,22 +2,22 @@
 
 ## Purpose
 
-Validate all 5 dimensions + aspect ratio.
+Validate all 6 dimensions + aspect ratio.
 
 ## Skip Conditions
 
 | Condition | Skipped Questions | Still Asked |
 |-----------|-------------------|-------------|
-| `--quick` flag | Type, Palette, Rendering, Text, Mood | **Aspect Ratio** (unless `--aspect` specified) |
+| `--quick` flag | Type, Palette, Rendering, Text, Mood, Font | **Aspect Ratio** (unless `--aspect` specified) |
-| All 5 dimensions + `--aspect` specified | All | None |
+| All 6 dimensions + `--aspect` specified | All | None |
-| `quick_mode: true` in EXTEND.md | Type, Palette, Rendering, Text, Mood | **Aspect Ratio** (unless `--aspect` specified) |
+| `quick_mode: true` in EXTEND.md | Type, Palette, Rendering, Text, Mood, Font | **Aspect Ratio** (unless `--aspect` specified) |
-| Otherwise | None | All 6 questions |
+| Otherwise | None | All 7 questions |
 
 **Important**: Aspect ratio is ALWAYS asked unless explicitly specified via `--aspect` CLI flag. User presets in EXTEND.md are shown as recommended option, not auto-selected.
 
 ## Quick Mode Output
 
-When skipping 5 dimensions:
+When skipping 6 dimensions:
 
 ```
 Quick Mode: Auto-selected dimensions
@@ -26,8 +26,9 @@ Quick Mode: Auto-selected dimensions
 • Rendering: [rendering] ([reason])
 • Text: [text] ([reason])
 • Mood: [mood] ([reason])
+• Font: [font] ([reason])
 
-[Then ask Question 6: Aspect Ratio]
+[Then ask Question 7: Aspect Ratio]
 ```
 
 ## Confirmation Flow
@@ -91,7 +92,26 @@ options:
     description: "Polished, precise, subtle gradients"
 ```
 
-### Q4: Other Settings (skip if all remaining dimensions already specified)
+### Q4: Font (skip if `--font`)
+
+```yaml
+header: "Font"
+question: "Which font style?"
+multiSelect: false
+options:
+  - label: "[auto-recommended font] (Recommended)"
+    description: "[reason based on content signals]"
+  - label: "clean"
+    description: "Modern geometric sans-serif - tech, professional"
+  - label: "handwritten"
+    description: "Warm hand-lettered - personal, friendly"
+  - label: "serif"
+    description: "Classic elegant - editorial, luxury"
+  - label: "display"
+    description: "Bold decorative - announcements, entertainment"
+```
+
+### Q5: Other Settings (skip if all remaining dimensions already specified)
 
 Combine remaining settings into one question. Include: Output Dir (if no preference + file path input), Text, Mood, Aspect. Show auto-selected values as recommended option. User can accept all or type adjustments via "Other".
 

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

@@ -26,6 +26,7 @@ Cover theme: [2-3 words visual interpretation]
 Type: [confirmed type]
 Palette: [confirmed palette]
 Rendering: [confirmed rendering]
+Font: [confirmed font]
 Text level: [confirmed text level]
 Mood: [confirmed mood]
 Aspect ratio: [confirmed ratio]
@@ -44,6 +45,13 @@ Language: [confirmed language]
 - balanced: "Use medium contrast, normal saturation, balanced visual weight"
 - bold: "Use high contrast, vivid saturated colors, heavy visual weight, dynamic energy"
 
+# Font Application
+[Based on font style:]
+- clean: "Use clean geometric sans-serif typography. Modern, minimal letterforms."
+- handwritten: "Use warm hand-lettered typography with organic brush strokes. Friendly, personal feel."
+- serif: "Use elegant serif typography with refined letterforms. Classic, editorial character."
+- display: "Use bold decorative display typography. Heavy, expressive headlines."
+
 # Composition
 Type composition:
 - [Type-specific layout and structure]