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/_ourdigital-shared/config/ourdigital.yaml

@@ -0,0 +1,141 @@
+# OurDigital Skills Configuration
+# Global settings for all ourdigital-* skills
+
+# =============================================================================
+# Environment
+# =============================================================================
+environment: development  # development | production
+
+# =============================================================================
+# Brand Settings
+# =============================================================================
+brand:
+  name: "OurDigital Clinic"
+  tagline: "우리 디지털 클리닉 | Your Digital Health Partner"
+  philosophy: "Precision + Empathy + Evidence"
+
+  values:
+    - key: data-driven
+      korean: 데이터 중심
+      metaphor: 정밀 검사
+    - key: in-action
+      korean: 실행 지향
+      metaphor: 실행 가능한 처방
+    - key: marketing-science
+      korean: 마케팅 과학
+      metaphor: 근거 중심 의학
+
+# =============================================================================
+# Channels
+# =============================================================================
+channels:
+  main:
+    domain: ourdigital.org
+    purpose: "Business & Consulting Hub"
+    tone: "Professional, Data-driven"
+
+  blog:
+    domain: blog.ourdigital.org
+    purpose: "Knowledge & Thought Leadership"
+    tone: "Analytical, Educational"
+    platform: ghost
+
+  journal:
+    domain: journal.ourdigital.org
+    purpose: "Creative Essays & Culture"
+    tone: "Conversational, Poetic"
+    platform: ghost
+
+  ourstory:
+    domain: ourstory.day
+    purpose: "Personal Narratives"
+    tone: "Intimate, Authentic"
+    platform: ghost
+
+  corporate:
+    domain: dintelligence.co.kr
+    purpose: "Corporate Partnership"
+    tone: "Professional, B2B"
+
+# =============================================================================
+# Color Palette
+# =============================================================================
+colors:
+  primary:
+    d-black: "#221814"
+    d-olive: "#cedc00"
+    d-green: "#287379"
+    d-blue: "#0075c0"
+    d-beige: "#f2f2de"
+    d-gray: "#ebebeb"
+    d-border: "#cdcac8"
+
+  hive:
+    yellow: "#ffe100"
+    orange: "#f1a615"
+    skyblue: "#21a8bc"
+
+  text:
+    black: "#000000"
+    gray: "#7a7a7b"
+    white: "#ffffff"
+
+# =============================================================================
+# Typography
+# =============================================================================
+typography:
+  korean: "Noto Sans KR"
+  english:
+    primary: "Noto Sans"
+    emphasis: "Inter"
+  grid_columns: 12
+
+# =============================================================================
+# Notion Integration
+# =============================================================================
+notion:
+  databases:
+    working_with_ai:
+      id: "f8f19ede-32bd-43ac-9f60-0651f6f40afe"
+      url: "https://www.notion.so/f529bd7b67ce4033bb70ce951d65c9e8"
+
+    ourdigital_channels:
+      id: "9e958359535b495e863aba20d6c0a59b"
+
+  default_properties:
+    ai_used: "Claude Code"
+    status: "In progress"
+
+# =============================================================================
+# Skill Settings
+# =============================================================================
+skills:
+  trigger_prefix: "ourdigital"
+
+  numbering:
+    core: "01-09"        # Brand, blog, journal, research, etc.
+    meta: "10"           # Skill creator
+    seo: "11-19"         # SEO tools
+    gtm: "20-29"         # GTM/Analytics
+    notion: "31-39"      # Notion tools
+    jamie: "40-49"       # Jamie Clinic
+
+  body_word_limit:
+    min: 800
+    max: 1200
+
+  directory_structure:
+    - code/
+    - desktop/
+    - shared/references/
+    - shared/templates/
+    - shared/scripts/
+    - docs/
+    - docs/logs/
+
+# =============================================================================
+# Export Paths
+# =============================================================================
+exports:
+  ulysses: "~/Library/Mobile Documents/com~apple~CloudDocs/Ulysses/Blog Drafts/"
+  local: "./output/"