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)

hooks/claude-codex-settings/scripts/notify.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+
+# Read JSON input from Claude Code hook
+input=$(cat)
+
+# Extract message from JSON (basic parsing)
+message=$(echo "$input" | grep -o '"message":"[^"]*"' | cut -d'"' -f4)
+title="Claude Code"
+
+# Terminal bell - triggers VSCode visual bell icon
+printf '\a'
+
+# Send OS notification
+if [[ "$OSTYPE" == "darwin"* ]]; then
+  osascript -e "display notification \"${message}\" with title \"${title}\" sound name \"Glass\""
+elif command -v notify-send &> /dev/null; then
+  notify-send "${title}" "${message}" -u normal -i terminal
+fi