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/skills/multi-agent-guide/templates/tasks-yaml.yaml

@@ -0,0 +1,48 @@
+# Agent Tasks Registry
+# Location: .agent-state/tasks.yaml
+#
+# This file tracks all tasks claimed by agents.
+# Agents must claim tasks before modifying associated files.
+
+version: "1.0"
+updated_at: "2025-01-29T00:00:00Z"
+
+# Task Status Values:
+# - pending: Available for claiming
+# - in_progress: Currently being worked on
+# - completed: Work finished successfully
+# - abandoned: Work stopped, task available for reclaiming
+# - blocked: Waiting on dependencies
+
+tasks: []
+
+# Example task entry:
+#
+# tasks:
+#   - id: "TASK-001"
+#     description: "Implement new feature"
+#     agent: "claude"
+#     status: "in_progress"
+#     priority: "high"
+#     files:
+#       - "src/feature.py"
+#       - "tests/test_feature.py"
+#     depends_on: []
+#     created_at: "2025-01-29T09:00:00Z"
+#     claimed_at: "2025-01-29T09:30:00Z"
+#     expires_at: "2025-01-29T13:30:00Z"
+#     completed_at: null
+#
+#   - id: "TASK-002"
+#     description: "Write API documentation"
+#     agent: null
+#     status: "pending"
+#     priority: "medium"
+#     files:
+#       - "docs/api.md"
+#     depends_on:
+#       - "TASK-001"
+#     created_at: "2025-01-29T10:00:00Z"
+#     claimed_at: null
+#     expires_at: null
+#     completed_at: null