feat: Add OurDigital custom skills package (10 skills)

Complete implementation of OurDigital skills with dual-platform support
(Claude Desktop + Claude Code) following standardized structure.

Skills created:
- 01-ourdigital-brand-guide: Brand reference & style guidelines
- 02-ourdigital-blog: Korean blog drafts (blog.ourdigital.org)
- 03-ourdigital-journal: English essays (journal.ourdigital.org)
- 04-ourdigital-research: Research prompts & workflows
- 05-ourdigital-document: Notion-to-presentation pipeline
- 06-ourdigital-designer: Visual/image prompt generation
- 07-ourdigital-ad-manager: Ad copywriting & keyword research
- 08-ourdigital-trainer: Training materials & workshop planning
- 09-ourdigital-backoffice: Quotes, proposals, cost analysis
- 10-ourdigital-skill-creator: Meta skill for creating new skills

Features:
- YAML frontmatter with "ourdigital" or "our" prefix triggers
- Standardized directory structure (code/, desktop/, shared/, docs/)
- Shared environment setup (_ourdigital-shared/)
- Comprehensive reference documentation
- Cross-skill integration support

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

custom-skills/06-ourdigital-designer/code/references/visual_metaphors.md

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+# Visual Metaphor Dictionary
+
+Quick reference for translating abstract concepts into visual elements.
+
+## Technology & Digital
+
+| Concept | Primary Metaphor | Alternative Visuals |
+|---------|-----------------|-------------------|
+| Algorithm | Constellation patterns | Maze structures, flow charts as art |
+| AI | Crystalline growth | Mirror reflections, fractal patterns |
+| Data | Water flow, particles | Bird murmurations, sand grains |
+| Network | Root systems | Neural pathways, spider silk, web |
+| Code | Musical notation | DNA strands, city blueprints |
+| Cloud | Atmospheric forms | Floating islands, ethereal spaces |
+| Privacy | Veils, shadows | One-way mirrors, fog, barriers |
+| Security | Locks dissolving | Fortresses becoming permeable |
+| Automation | Clockwork organic | Self-assembling structures |
+| Virtual | Layers of reality | Parallel dimensions, glass planes |
+
+## Social & Cultural
+
+| Concept | Primary Metaphor | Alternative Visuals |
+|---------|-----------------|-------------------|
+| Identity | Layered masks | Fingerprints merging, mirrors |
+| Community | Overlapping circles | Shared spaces, woven threads |
+| Isolation | Islands in fog | Glass barriers, empty chairs |
+| Communication | Bridge structures | Echo patterns, light beams |
+| Conflict | Opposing forces | Tectonic plates, storm systems |
+| Harmony | Resonance patterns | Orchestra arrangements, balance |
+| Culture | Textile patterns | Layered sediments, palimpsest |
+| Tradition | Tree rings | Ancient stones, inherited objects |
+| Change | Metamorphosis | Phase transitions, seasonal cycles |
+| Power | Pyramids inverting | Current flows, gravity wells |
+
+## Philosophical & Abstract
+
+| Concept | Primary Metaphor | Alternative Visuals |
+|---------|-----------------|-------------------|
+| Time | Spirals, loops | Sediment layers, clock dissolution |
+| Knowledge | Light sources | Growing trees, opening books |
+| Wisdom | Mountain vistas | Deep waters, ancient libraries |
+| Truth | Clear water | Prisms splitting light, unveiled |
+| Illusion | Distorted mirrors | Smoke shapes, double images |
+| Choice | Diverging paths | Doors opening, quantum splits |
+| Balance | Tensegrity | Scales reimagined, equilibrium |
+| Paradox | Möbius strips | Impossible objects, Escher-like |
+| Existence | Breath patterns | Pulse rhythms, presence/absence |
+| Consciousness | Nested awareness | Recursive mirrors, awakening |
+
+## Emotional States
+
+| Emotion | Visual Translation | Color Association |
+|---------|-------------------|------------------|
+| Anxiety | Fragmented grids | Desaturated, glitch |
+| Hope | Light breaking through | Warm gradients |
+| Melancholy | Soft dissolution | Muted blues, grays |
+| Joy | Expansion patterns | Bright, ascending |
+| Fear | Contracting spaces | Sharp contrasts |
+| Peace | Still water | Soft neutrals |
+| Confusion | Tangled lines | Overlapping hues |
+| Clarity | Clean geometry | Pure, minimal |
+
+## Transformation & Process
+
+| Process | Visual Narrative | Symbolic Elements |
+|---------|------------------|------------------|
+| Growth | Seeds → trees | Fibonacci spirals |
+| Decay | Entropy patterns | Rust, dissolution |
+| Evolution | Branching forms | Darwin's tree reimagined |
+| Revolution | Circles breaking | Shattered patterns |
+| Innovation | Spark → flame | Lightning, fusion |
+| Tradition | Continuous thread | Inherited patterns |
+| Disruption | Broken grids | Glitch aesthetics |
+| Integration | Merging streams | Confluence points |
+
+## Korean-Western Fusion Elements
+
+| Korean Element | Western Parallel | Fusion Approach |
+|---------------|-----------------|-----------------|
+| 여백 (Empty space) | Negative space | Active emptiness |
+| 오방색 (Five colors) | Color theory | Symbolic palette |
+| 달항아리 (Moon jar) | Minimalism | Imperfect circles |
+| 한글 geometry | Typography | Structural letters |
+| 산수화 (Landscape) | Abstract landscape | Atmospheric depth |
+| 전통문양 (Patterns) | Geometric design | Cultural geometry |
+
+## Usage Notes
+
+1. **Layer metaphors**: Combine 2-3 for depth
+2. **Avoid clichés**: No obvious tech symbols
+3. **Cultural sensitivity**: Universal over specific
+4. **Abstraction levels**: Match essay tone
+5. **Emotional resonance**: Feel over literal
+
+## Quick Selection Guide
+
+For **technology essays**: organic-digital hybrids
+For **social commentary**: human elements in systems  
+For **philosophy pieces**: space and light
+For **cultural topics**: layered traditions
+For **future themes**: transformation states