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/10-ourdigital-skill-creator/shared/references/skill-patterns.md

@@ -0,0 +1,203 @@
+# OurDigital Skill Patterns
+
+Common patterns and best practices for OurDigital Claude Skills.
+
+## Directory Structure Pattern
+
+```
+XX-ourdigital-{name}/
+├── code/
+│   └── SKILL.md          # Claude Code version
+├── desktop/
+│   └── SKILL.md          # Claude Desktop version
+├── shared/
+│   ├── references/       # Documentation
+│   ├── templates/        # Reusable templates
+│   └── scripts/          # Utility scripts
+├── docs/
+│   ├── CHANGELOG.md      # Version history
+│   └── logs/             # Update logs
+└── README.md             # Overview
+```
+
+## YAML Frontmatter Pattern
+
+```yaml
+---
+name: ourdigital-{skill-name}
+description: |
+  [One-line purpose statement]
+  Activated with "ourdigital" keyword.
+
+  Triggers:
+  - "ourdigital {keyword1}", "ourdigital {keyword2}"
+  - "ourdigital-{skill-name} {action}"
+
+  Features:
+  - Feature 1 description
+  - Feature 2 description
+version: "1.0"
+author: OurDigital
+environment: Desktop | Code | Both
+dependencies:
+  python: ">=3.11"
+  packages: ["package1", "package2"]
+---
+```
+
+## Workflow Patterns
+
+### Linear Workflow
+
+```
+Phase 1 → Phase 2 → Phase 3 → Output
+```
+
+Example: ourdigital-blog
+```
+Topic Input → Research → Draft → SEO Meta → Export
+```
+
+### Interactive Q&A Workflow
+
+```
+Ask Q1 → Get A1 → Ask Q2 → Get A2 → Process → Output
+```
+
+Example: ourdigital-skill-creator
+```
+Purpose? → Triggers? → Tools? → Output? → Generate
+```
+
+### Multi-Output Workflow
+
+```
+Input → Process → Output A
+              └→ Output B
+              └→ Output C
+```
+
+Example: ourdigital-designer
+```
+Brief → Analyze → DALL-E prompt
+               └→ Midjourney prompt
+               └→ Figma spec
+```
+
+## Trigger Patterns
+
+### Korean + English Pairs
+
+```yaml
+Triggers:
+- "ourdigital 블로그", "ourdigital blog"
+- "ourdigital 작성", "ourdigital write"
+```
+
+### Action-Based
+
+```yaml
+Triggers:
+- "ourdigital create {type}"
+- "ourdigital generate {type}"
+- "ourdigital check {type}"
+```
+
+### Skill Name Direct
+
+```yaml
+Triggers:
+- "ourdigital-blog 초안"
+- "ourdigital-designer 프롬프트"
+```
+
+## Output Patterns
+
+### File Export
+
+```markdown
+## Output
+
+Export to:
+- iCloud/Ulysses folder: `.md` files
+- Google Drive: `.docx`, `.pptx`
+- Local: `./output/`
+```
+
+### Notion Integration
+
+```markdown
+## Notion Save
+
+Database: Working with AI
+Properties:
+- Name: [Output title]
+- Status: Done
+- AI used: Claude Code
+```
+
+### Artifact Generation
+
+```markdown
+## Artifact
+
+Generate HTML artifact with:
+- Structured sections
+- Styled formatting
+- Export options
+```
+
+## Reference Patterns
+
+### Style Guide Reference
+
+```markdown
+See `shared/references/style-guide.md` for:
+- Tone and voice
+- Terminology
+- Formatting rules
+```
+
+### API Config Reference
+
+```markdown
+See `shared/references/api-config.md` for:
+- Endpoint URLs
+- Authentication
+- Rate limits
+```
+
+### Template Reference
+
+```markdown
+Use `shared/templates/{template}.md` as base structure.
+```
+
+## Version Numbering
+
+```
+Major.Minor.Patch
+
+1.0.0 - Initial release
+1.1.0 - New feature added
+1.1.1 - Bug fix
+2.0.0 - Breaking change
+```
+
+## Changelog Pattern
+
+```markdown
+## [1.1.0] - 2026-01-31
+
+### Added
+- New feature X
+
+### Changed
+- Updated behavior Y
+
+### Fixed
+- Bug in Z
+
+### Notion Ref
+- https://notion.so/page-id
+```