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/91-multi-agent-guide/commands/setup-agents.md

@@ -0,0 +1,56 @@
+---
+name: setup-agents
+description: Initialize multi-agent collaboration framework for the current project
+---
+
+# Setup Multi-Agent Collaboration
+
+You are initializing a multi-agent collaboration framework for this project.
+
+## Your Task
+
+Guide the user through setting up a complete multi-agent framework by:
+
+1. **Assess the project**:
+   - Identify the project type (Python, Node.js, monorepo, etc.)
+   - Determine the source code structure
+   - Check for existing configuration files
+
+2. **Gather requirements** using AskUserQuestion:
+   - Which agents will participate? (Claude, Gemini, Codex, custom)
+   - What are the main ownership domains for each agent?
+   - Do they want CI/CD integration? (GitHub Actions, GitLab CI)
+   - Do they want pre-commit hooks?
+
+3. **Create the framework files**:
+   - `.agent-state/tasks.yaml` - Task registry
+   - `.agent-state/locks.yaml` - Lock registry
+   - `tools/check-ownership.py` - Ownership verification script
+   - `AGENTS.md` - Shared collaboration rules
+   - `GUARDRAILS.md` - Ownership and enforcement rules
+   - `CLAUDE.md` - Lead agent directive
+   - Agent-specific files (GEMINI.md, CODEX.md) if needed
+
+4. **Configure tooling**:
+   - Update or create `.pre-commit-config.yaml` if requested
+   - Create `.github/workflows/ownership-check.yml` if GitHub Actions requested
+
+5. **Customize ownership matrix**:
+   - Update `OWNERSHIP_MATRIX` in check-ownership.py based on project structure
+   - Configure shared and unrestricted files
+
+## Templates
+
+Use templates from the skill directory:
+- `${CLAUDE_PLUGIN_ROOT}/skills/multi-agent-guide/templates/`
+
+## After Setup
+
+Remind the user to:
+1. Set `SEO_AGENT_AUTHOR` environment variable
+2. Install pre-commit hooks: `pre-commit install`
+3. Verify setup: `python tools/check-ownership.py --verify-setup`
+
+## Output
+
+Provide a summary of created files and next steps.