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/01-ourdigital-brand-guide/code/SKILL.md

@@ -0,0 +1,145 @@
+---
+name: ourdigital-brand-guide
+description: |
+  OurDigital brand standards and style guide reference.
+  Activated with "ourdigital" keyword for brand queries.
+
+  Triggers:
+  - "ourdigital 브랜드 가이드", "ourdigital brand guide"
+  - "ourdigital 톤앤매너", "ourdigital style check"
+  - "ourdigital 브랜드 적합성", "ourdigital voice"
+
+  Features:
+  - Brand foundation reference
+  - Writing style guidelines
+  - Visual identity standards
+  - Brand compliance checking
+version: "1.0"
+author: OurDigital
+environment: Code
+---
+
+# OurDigital Brand Guide (Code)
+
+Reference skill for OurDigital brand standards in Claude Code environment.
+
+## Activation
+
+Only with "ourdigital" keyword:
+- "ourdigital 브랜드 가이드"
+- "ourdigital brand check"
+
+## Brand Quick Reference
+
+### Identity
+
+```yaml
+Brand: OurDigital Clinic
+Tagline: 우리 디지털 클리닉 | Your Digital Health Partner
+Mission: 디지털 마케팅 클리닉 for SMBs
+Promise: 진단-처방-측정 가능한 성장
+Philosophy: Precision + Empathy + Evidence
+```
+
+### Core Values
+
+| Value | Korean | Metaphor |
+|-------|--------|----------|
+| Data-driven | 데이터 중심 | 정밀 검사 |
+| In-Action | 실행 지향 | 실행 가능한 처방 |
+| Marketing Science | 마케팅 과학 | 근거 중심 의학 |
+
+## Channel Tone
+
+| Channel | Tone |
+|---------|------|
+| ourdigital.org | Professional, Data-driven |
+| blog.ourdigital.org | Analytical, Educational |
+| journal.ourdigital.org | Conversational, Poetic |
+| ourstory.day | Intimate, Authentic |
+
+## Writing Style
+
+### Korean Style
+
+1. **철학-기술 융합**: 기술과 인간적 함의 연결
+2. **역설 활용**: 긴장/모순으로 논증
+3. **수사적 질문**: 질문으로 참여 유도
+4. **우울한 낙관주의**: 불안 인정, 절망 거부
+
+### Writing Rules
+
+**Do:**
+- Paradox for structure
+- Rhetorical questions
+- Korean + English technical terms
+- Historical/generational context
+
+**Don't:**
+- Purely declarative authority
+- Simplistic optimism
+- Prescriptive conclusions
+- Ignoring cultural impact
+
+## Color Palette
+
+```css
+/* Primary */
+--d-black: #221814;   /* Dark backgrounds */
+--d-olive: #cedc00;   /* Primary accent, CTA */
+--d-green: #287379;   /* Secondary accent */
+--d-blue: #0075c0;    /* Links */
+--d-beige: #f2f2de;   /* Light on dark */
+--d-gray: #ebebeb;    /* Alt backgrounds */
+--d-border: #cdcac8;  /* Borders */
+
+/* D.HIVE */
+--d-hive-yellow: #ffe100;
+--d-hive-orange: #f1a615;
+--d-hive-skyblue: #21a8bc;
+```
+
+### Typography
+
+- Korean: `Noto Sans KR`
+- English: `Noto Sans`, `Inter`
+- Grid: 12-column
+
+## Brand Compliance
+
+Check content against:
+
+1. ✓ Channel tone match
+2. ✓ Core values reflected
+3. ✓ Philosophy alignment
+4. ✓ Language style correct
+5. ✓ Color palette used
+
+## Key Messages
+
+| Purpose | Message |
+|---------|---------|
+| Tagline | 우리 디지털 클리닉 |
+| Value | 데이터로 진단하고, 실행으로 처방합니다 |
+| Process | 진단 → 처방 → 측정 |
+
+## CTA Library
+
+```
+무료 상담 신청하기
+SEO 진단 신청하기
+콘텐츠 전략 상담 신청하기
+맞춤 견적 상담받기
+```
+
+## File References
+
+```
+01-ourdigital-brand-guide/
+├── shared/references/
+│   ├── brand-foundation.md
+│   ├── writing-style.md
+│   └── color-palette.md
+└── shared/assets/
+    └── tokens.css
+```