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/locks-yaml.yaml

@@ -0,0 +1,42 @@
+# Agent File Locks Registry
+# Location: .agent-state/locks.yaml
+#
+# This file tracks file/directory locks held by agents.
+# Agents must acquire locks before modifying files.
+
+version: "1.0"
+updated_at: "2025-01-29T00:00:00Z"
+
+# Lock Types:
+# - exclusive: Only one agent can modify (blocks all others)
+# - shared: Multiple can read, one can write
+# - override: Claude override for conflict resolution
+
+locks: []
+
+# Example lock entry:
+#
+# locks:
+#   - path: "src/core/"
+#     agent: "claude"
+#     lock_type: "exclusive"
+#     task_id: "TASK-001"
+#     reason: "Refactoring core module"
+#     created_at: "2025-01-29T10:00:00Z"
+#     expires_at: "2025-01-29T14:00:00Z"
+#
+#   - path: "docs/api/"
+#     agent: "gemini"
+#     lock_type: "shared"
+#     task_id: "TASK-002"
+#     reason: "Updating API documentation"
+#     created_at: "2025-01-29T11:00:00Z"
+#     expires_at: "2025-01-29T15:00:00Z"
+#
+#   - path: "tests/"
+#     agent: "codex"
+#     lock_type: "exclusive"
+#     task_id: "TASK-003"
+#     reason: "Adding comprehensive tests"
+#     created_at: "2025-01-29T12:00:00Z"
+#     expires_at: "2025-01-29T16:00:00Z"