Add obsidian-official-cli skill from ClawhHub

Obsidian CLI (v1.12+) reference skill for all agents — covers file ops,
search, tasks, templates, plugins, sync, and dev tools.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

skills/obsidian-official-cli/CHANGELOG.md

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+# Changelog
+
+All notable changes to the Obsidian Official CLI Skill will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+## [1.0.0] - 2026-02-10
+
+### Added
+- Initial release of the Obsidian Official CLI skill
+- Comprehensive coverage of Obsidian CLI v1.12+ commands
+- File operations: create, read, edit, move, delete
+- Search and discovery: full-text search, tag management, link analysis
+- Daily notes and task management
+- Template and bookmark operations
+- Plugin and theme management
+- Obsidian Sync integration
+- File history and version control
+- Developer tools and debugging commands
+- TUI mode support with interactive features
+- Complete documentation with examples and troubleshooting
+- Platform-specific setup instructions (macOS, Linux, Windows)
+
+### Features
+- Auto-triggering based on Obsidian-related queries
+- Support for all CLI parameter types and flags
+- Vault targeting with multiple syntax options
+- Copy-to-clipboard functionality
+- Comprehensive error handling and validation
+- Progressive disclosure design for optimal context usage
+
+### Requirements
+- Obsidian 1.12+ with Catalyst license
+- CLI enabled in Obsidian settings
+- OpenClaw skill system
+
+### Documentation
+- Complete command reference
+- Usage examples and patterns
+- Setup and troubleshooting guides
+- TUI keyboard shortcuts
+- Best practices for vault management