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/07-ourdigital-ad-manager/code/SKILL.md

@@ -0,0 +1,133 @@
+---
+name: ourdigital-ad-manager
+description: |
+  Ad copywriting and keyword research for OurDigital marketing.
+  Activated with "ourdigital" keyword.
+
+  Triggers:
+  - "ourdigital ad copy", "ourdigital 광고 카피"
+  - "ourdigital keyword", "ourdigital 키워드"
+
+  Features:
+  - Script-based ad generation
+  - Keyword research automation
+  - Bulk ad copy creation
+version: "1.0"
+author: OurDigital
+environment: Code
+---
+
+# OurDigital Ad Manager (Code)
+
+Automated ad copywriting and keyword research with script support.
+
+## Activation
+
+Only with "ourdigital" keyword:
+- "ourdigital ad copy [product]"
+- "ourdigital 광고 카피"
+
+## Quick Start
+
+```bash
+# Generate Google Ads copy
+python code/scripts/generate_ads.py \
+  --product "SEO 컨설팅" \
+  --platform google \
+  --variations 3
+
+# Keyword research
+python code/scripts/keyword_research.py \
+  --seed "데이터 분석" \
+  --market korea
+
+# Bulk ad generation
+python code/scripts/generate_ads.py \
+  --input keywords.csv \
+  --platform naver \
+  --output ads.csv
+```
+
+## Scripts
+
+| Script | Purpose |
+|--------|---------|
+| `generate_ads.py` | Create ad copy variations |
+| `keyword_research.py` | Keyword volume research |
+| `ad_analyzer.py` | Competitor ad analysis |
+
+## Ad Generation
+
+```bash
+# Single product
+python code/scripts/generate_ads.py \
+  --product "GTM 설정 서비스" \
+  --platform google \
+  --tone professional
+
+# With USP
+python code/scripts/generate_ads.py \
+  --product "데이터 분석" \
+  --usp "10년 경력" \
+  --cta "무료 상담"
+```
+
+## Keyword Research
+
+```bash
+# Basic research
+python code/scripts/keyword_research.py \
+  --seed "마케팅 자동화" \
+  --market korea
+
+# With competitors
+python code/scripts/keyword_research.py \
+  --seed "SEO" \
+  --competitors "competitor1.com,competitor2.com"
+```
+
+## Platform Specs
+
+| Platform | Headline | Description |
+|----------|----------|-------------|
+| Google | 30×3 chars | 90×2 chars |
+| Naver | 25 chars | 45 chars |
+| Meta | 40 chars | 125 chars |
+
+## Output Formats
+
+```bash
+# JSON output
+python code/scripts/generate_ads.py --format json
+
+# CSV for bulk upload
+python code/scripts/generate_ads.py --format csv
+
+# Markdown report
+python code/scripts/keyword_research.py --format markdown
+```
+
+## File Structure
+
+```
+07-ourdigital-ad-manager/
+├── code/
+│   ├── SKILL.md
+│   └── scripts/
+│       ├── generate_ads.py
+│       ├── keyword_research.py
+│       └── ad_analyzer.py
+├── desktop/SKILL.md
+├── shared/references/
+│   ├── ad-copy-formulas.md
+│   └── platform-specs.md
+└── docs/CHANGELOG.md
+```
+
+## Quick Commands
+
+| Command | Action |
+|---------|--------|
+| "ourdigital ad copy [product]" | Generate ads |
+| "ourdigital keyword [topic]" | Research keywords |
+| "ourdigital ad → csv" | Bulk export |