Add comprehensive skills, agents, commands collection

- Added 44 external skills from obra/superpowers, ui-ux-pro-max-skill, claude-codex-settings
- Added 8 autonomous agents (commit-creator, pr-creator, pr-reviewer, etc.)
- Added 23 slash commands for Git/GitHub, setup, and plugin development
- Added hooks for code formatting, notifications, and validation
- Added MCP configurations for Azure, GCloud, Supabase, MongoDB, etc.
- Added awesome-openclaw-skills registry (3,002 skills referenced)
- Updated comprehensive README with full documentation

Sources:
- github.com/obra/superpowers (14 skills)
- github.com/nextlevelbuilder/ui-ux-pro-max-skill (1 skill)
- github.com/fcakyon/claude-codex-settings (29 skills, 8 agents, 23 commands)
- github.com/VoltAgent/awesome-openclaw-skills (registry)
- skills.sh (reference)
- buildwithclaude.com (reference)

commands/claude-codex-settings/plugin-dev-load-skills.md

@@ -0,0 +1,18 @@
+---
+description: Load all plugin development skills
+allowed-tools: Read
+---
+
+# Load Plugin Development Skills
+
+Read all plugin development SKILL.md files to provide guidance. The files are located at:
+
+- @${CLAUDE_PLUGIN_ROOT}/skills/plugin-structure/SKILL.md
+- @${CLAUDE_PLUGIN_ROOT}/skills/agent-development/SKILL.md
+- @${CLAUDE_PLUGIN_ROOT}/skills/command-development/SKILL.md
+- @${CLAUDE_PLUGIN_ROOT}/skills/skill-development/SKILL.md
+- @${CLAUDE_PLUGIN_ROOT}/skills/hook-development/SKILL.md
+- @${CLAUDE_PLUGIN_ROOT}/skills/mcp-integration/SKILL.md
+- @${CLAUDE_PLUGIN_ROOT}/skills/plugin-settings/SKILL.md
+
+Use this guidance to help with plugin development tasks.