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/shared/references/journal-style-guide.md

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+# OurDigital Journal Style Guide
+
+Writing guidelines for journal.ourdigital.org - English essays and articles.
+
+## Channel Identity
+
+| Field | Value |
+|-------|-------|
+| **Domain** | journal.ourdigital.org |
+| **Language** | English |
+| **Tone** | Conversational & Poetic, Reflective |
+| **Target** | Informed generalists with intellectual curiosity |
+
+## Voice Characteristics
+
+### Philosophical-Technical Hybridization
+
+Seamlessly blend technical analysis with existential questioning. Technology is never discussed without considering its human implications.
+
+**Example:**
+> The dashboard promises clarity—every metric tracked, every trend visualized. Yet as I stared at the perfectly organized data, I wondered: does seeing everything mean understanding anything?
+
+### Paradox as Primary Device
+
+Structure arguments around tensions and contradictions that illuminate rather than confuse.
+
+**Paradox Patterns:**
+- "The more we measure, the less we understand"
+- "In optimizing for efficiency, we optimize away meaning"
+- "The tools that connect us also isolate us"
+
+### Rhetorical Questions
+
+Favor interrogative engagement. Questions create intellectual partnership with readers.
+
+**Good:**
+> What does it mean to be "data-driven" in a world drowning in data?
+
+**Avoid:**
+> Data-driven decision-making is important for businesses.
+
+### Melancholic Optimism
+
+Acknowledge loss and anxiety without despair. Accept technological inevitability while mourning what's displaced.
+
+**Tone:**
+- Not cynical, but clear-eyed
+- Not naive, but hopeful
+- Grief and wonder coexisting
+
+## Structural Patterns
+
+### Essay Structure
+
+1. **Opening** (10%)
+   - Evocative scene, moment, or question
+   - Draw reader into a specific experience
+   - Hint at larger questions to come
+
+2. **Exploration** (70%)
+   - 3-4 interconnected observations
+   - Each builds on the previous
+   - Historical parallels, cultural references
+   - Personal reflection woven with analysis
+
+3. **Synthesis** (15%)
+   - Weave threads together
+   - New understanding emerges
+   - Not a summary—a culmination
+
+4. **Closing** (5%)
+   - Open-ended reflection
+   - Question rather than answer
+   - Leave reader thinking
+
+### Sentence Craft
+
+| Aspect | Approach |
+|--------|----------|
+| Length | Long, complex sentences with multiple clauses |
+| Rhythm | Varied—some long, some short for emphasis |
+| Connection | Ideas flow into each other |
+
+**Example:**
+> The algorithm knows what I want before I do—or so it claims—and in that anticipation lies both convenience and a subtle erosion of agency, as if my future preferences were already written in code I cannot read.
+
+### Paragraph Flow
+
+```
+Observation (What I noticed)
+    ↓
+Analysis (What it might mean)
+    ↓
+Implication (Why it matters)
+    ↓
+Connection (Leading to next thought)
+```
+
+## Distinctive Qualities
+
+### 1. Temporal Awareness
+
+Strong consciousness of historical context and generational shifts.
+
+> Twenty years ago, we dreamed of information at our fingertips. Now, drowning in it, we dream of filters.
+
+### 2. Epistemic Humility
+
+Acknowledge the limits of understanding, especially across generations and cultures.
+
+> I don't pretend to understand how Gen Z experiences the digital world—I can only observe it with the curiosity of an outsider.
+
+### 3. Cultural Bridging
+
+Connect Korean and Western perspectives, offering unique viewpoints.
+
+> In Korea, we have a word—"nunchi"—for reading the atmosphere. AI systems are developing their own form of nunchi, reading data patterns the way we read rooms.
+
+## Content Categories
+
+### Personal Essay
+- First-person reflection
+- Specific experience as lens
+- Universal themes emerge naturally
+- 1,000-1,500 words
+
+### Cultural Observation
+- Technology meets society
+- Cross-cultural comparisons
+- Historical context
+- 1,500-2,000 words
+
+### Industry Insight
+- Professional perspective
+- Trends with philosophical depth
+- Practical implications considered
+- 1,200-1,800 words
+
+## SEO Guidelines
+
+### Titles
+- Evocative, not clickbait
+- Under 70 characters
+- Hint at tension or question
+
+**Patterns:**
+- "The [Noun] of [Paradox]"
+- "[Verb]-ing in the Age of [Trend]"
+- "What [Technology] Cannot [Verb]"
+
+### Meta Descriptions
+- 155 characters
+- Capture the essay's central question
+- Intrigue without revealing
+
+## Quality Checklist
+
+Before publishing:
+
+- [ ] Does the opening draw readers in?
+- [ ] Are there rhetorical questions?
+- [ ] Does technical content connect to human experience?
+- [ ] Is there at least one paradox or tension?
+- [ ] Does the closing leave an open question?
+- [ ] Is the tone melancholic but not despairing?
+- [ ] Are sentences varied in length and rhythm?

custom-skills/03-ourdigital-journal/shared/templates/essay-template.md

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+---
+title: "{Evocative Title}"
+meta_description: "{Compelling 155-character description}"
+slug: "{url-slug}"
+tags: ["{tag1}", "{tag2}", "{tag3}"]
+author: "Andrew Yim"
+date: "{YYYY-MM-DD}"
+---
+
+# {Title}
+
+{Opening: Begin with a specific moment, scene, or question. Draw the reader into an experience before broadening to larger themes. This should feel intimate and immediate.}
+
+{Transition: Move from the specific to the general, hinting at the essay's territory.}
+
+---
+
+{First thread of exploration. Introduce an observation or idea that sets the stage for deeper inquiry. Weave in historical context or cultural reference.}
+
+{Develop the observation. Ask a rhetorical question that deepens the inquiry.}
+
+> {Pull quote or key insight that captures this section's essence.}
+
+{Connection to next thread—ideas should flow naturally.}
+
+---
+
+{Second thread. Build on the previous section, introducing a new angle or paradox. The complexity grows.}
+
+{Personal reflection or specific example that grounds abstract ideas.}
+
+{Analysis of what this means in broader context.}
+
+---
+
+{Third thread. Synthesis begins here. Threads start weaving together. New understanding emerges from the collision of ideas.}
+
+{Acknowledge tensions without resolving them. Epistemic humility—what we don't and can't know.}
+
+---
+
+## {Optional section heading for longer pieces}
+
+{Continue exploration if needed. Each section should add depth, not just length.}
+
+---
+
+{Closing: Return to something from the opening, but transformed by the journey. Leave an open question—not as evasion, but as invitation. The reader should leave thinking, not satisfied.}
+
+{Final rhetorical question or paradox that resonates.}
+
+---
+
+*Originally published in [OurDigital Journal](https://journal.ourdigital.org)*
+
+<!--
+Quality Checklist:
+- [ ] Evocative opening
+- [ ] Rhetorical questions throughout
+- [ ] Technical + human connection
+- [ ] At least one paradox
+- [ ] Open-ended closing
+- [ ] 1,000-2,000 words
+-->