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/03-ourdigital-journal/desktop/SKILL.md

@@ -0,0 +1,173 @@
+---
+name: ourdigital-journal
+description: |
+  English essay and article creation for journal.ourdigital.org.
+  Activated with "ourdigital" keyword for English writing tasks.
+
+  Triggers (ourdigital or our prefix):
+  - "ourdigital journal", "our journal"
+  - "ourdigital English essay", "our English essay"
+  - "ourdigital 영문 에세이", "our 영문 에세이"
+
+  Features:
+  - English essay/article generation
+  - Research-based insights
+  - Reflective, poetic style
+  - Ghost CMS format output
+version: "1.0"
+author: OurDigital
+environment: Desktop
+---
+
+# OurDigital Journal
+
+English essay and article creation for journal.ourdigital.org.
+
+## Activation
+
+Activate with "ourdigital" or "our" prefix:
+- "ourdigital journal" / "our journal"
+- "ourdigital English essay" / "our English essay"
+- "our 영문 에세이 [topic]"
+- "ourdigital 영문 에세이 [주제]"
+
+## Channel Profile
+
+| Field | Value |
+|-------|-------|
+| **URL** | journal.ourdigital.org |
+| **Language** | English |
+| **Tone** | Conversational & Poetic, Reflective |
+| **Platform** | Ghost CMS |
+| **Frequency** | 월 2-4회 |
+| **Length** | 1,000-2,000 words |
+
+## Workflow
+
+### Phase 1: Topic Exploration
+
+Ask clarifying questions:
+
+1. **Topic**: What specific angle interests you?
+2. **Audience**: Tech professionals / General readers / Academic?
+3. **Depth**: Personal reflection / Industry analysis / Cultural observation?
+
+### Phase 2: Research (Optional)
+
+If topic requires current context:
+- Use `web_search` for recent developments
+- Reference scholarly perspectives if applicable
+- Draw from historical or cultural parallels
+
+### Phase 3: Essay Generation
+
+Generate essay following the reflective style:
+
+**Structure:**
+```
+1. Opening (Evocative scene or question)
+2. Exploration (3-4 interconnected observations)
+3. Synthesis (Weaving threads together)
+4. Closing (Open-ended reflection)
+```
+
+**Writing Style:**
+- Philosophical-Technical Hybridization
+- Paradox as primary rhetorical device
+- Rhetorical questions for engagement
+- Melancholic optimism in tone
+
+**Distinctive Qualities:**
+- Temporal awareness (historical context)
+- Epistemic humility (acknowledging limits)
+- Cultural bridging (Korean-global perspectives)
+
+### Phase 4: SEO Metadata
+
+Generate metadata:
+
+```yaml
+title: [Evocative, under 70 characters]
+meta_description: [Compelling summary, 155 characters]
+slug: [english-url-slug]
+tags: [3-5 relevant tags]
+```
+
+### Phase 5: Output Format
+
+**Markdown Output:**
+```markdown
+---
+title: "Essay Title"
+meta_description: "Description"
+slug: "url-slug"
+tags: ["tag1", "tag2"]
+---
+
+# Essay Title
+
+[Essay content with paragraphs that flow naturally]
+
+---
+*Published in [OurDigital Journal](https://journal.ourdigital.org)*
+```
+
+## Writing Guidelines
+
+### Voice Characteristics
+
+| Aspect | Approach |
+|--------|----------|
+| Perspective | First-person reflection welcome |
+| Tone | Thoughtful, observant, wondering |
+| Pacing | Unhurried, allowing ideas to breathe |
+| References | Cross-cultural, historical, literary |
+
+### Sentence Craft
+
+- Long, complex sentences reflecting interconnected ideas
+- Progressive deepening: observation → analysis → implication
+- Questions that invite rather than lecture
+
+### Do's and Don'ts
+
+**Do:**
+- Blend technology with humanity
+- Use paradox to illuminate tensions
+- Acknowledge uncertainty gracefully
+- Bridge Korean and Western perspectives
+
+**Don't:**
+- Lecture or prescribe
+- Oversimplify complex issues
+- Ignore cultural context
+- Rush to conclusions
+
+## Content Types
+
+| Type | Focus | Length |
+|------|-------|--------|
+| Personal Essay | Reflection on experience | 1,000-1,500 words |
+| Cultural Observation | Tech + society analysis | 1,500-2,000 words |
+| Industry Insight | Trends with perspective | 1,200-1,800 words |
+
+## Ghost Integration
+
+Export options:
+1. **Markdown file** → Editorial review → Ghost
+2. **Direct API** → Ghost Admin API
+
+API endpoint: `GHOST_JOURNAL_URL` from environment
+
+## Quick Commands
+
+| Command | Action |
+|---------|--------|
+| "ourdigital journal [topic]" | Full essay workflow |
+| "ourdigital journal edit" | Edit existing draft |
+
+## References
+
+- `shared/references/journal-style-guide.md` - Detailed writing guide
+- `shared/templates/essay-template.md` - Essay structure
+- `01-ourdigital-brand-guide` - Brand voice reference