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/enforce_rg_over_grep.py

@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+import json
+import re
+import sys
+
+# Define validation rules as a list of (regex pattern, message) tuples
+VALIDATION_RULES = [
+    (
+        r"\bgrep\b(?!.*\|)",
+        "Use 'rg' (ripgrep) instead of 'grep' for better performance and features",
+    ),
+    (
+        r"\bfind\s+\S+\s+-name\b",
+        "Use 'rg --files | rg pattern' or 'rg --files -g pattern' instead of 'find -name' for better performance",
+    ),
+]
+
+
+def validate_command(command: str) -> list[str]:
+    issues = []
+    for pattern, message in VALIDATION_RULES:
+        if re.search(pattern, command):
+            issues.append(message)
+    return issues
+
+
+try:
+    input_data = json.load(sys.stdin)
+except json.JSONDecodeError as e:
+    print(f"Error: Invalid JSON input: {e}", file=sys.stderr)
+    sys.exit(1)
+
+tool_name = input_data.get("tool_name", "")
+tool_input = input_data.get("tool_input", {})
+command = tool_input.get("command", "")
+
+if tool_name != "Bash" or not command:
+    sys.exit(0)
+
+# Validate the command
+issues = validate_command(command)
+
+if issues:
+    for message in issues:
+        print(f"• {message}", file=sys.stderr)
+    # Exit code 2 blocks tool call and shows stderr to Claude
+    sys.exit(2)