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)

skills/external/plugin-dev-plugin-settings/scripts/parse-frontmatter.sh

@@ -0,0 +1,59 @@
+#!/bin/bash
+# Frontmatter Parser Utility
+# Extracts YAML frontmatter from .local.md files
+
+set -euo pipefail
+
+# Usage
+show_usage() {
+  echo "Usage: $0 <settings-file.md> [field-name]"
+  echo ""
+  echo "Examples:"
+  echo "  # Show all frontmatter"
+  echo "  $0 .claude/my-plugin.local.md"
+  echo ""
+  echo "  # Extract specific field"
+  echo "  $0 .claude/my-plugin.local.md enabled"
+  echo ""
+  echo "  # Extract and use in script"
+  echo "  ENABLED=\$($0 .claude/my-plugin.local.md enabled)"
+  exit 0
+}
+
+if [ $# -eq 0 ] || [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
+  show_usage
+fi
+
+FILE="$1"
+FIELD="${2:-}"
+
+# Validate file
+if [ ! -f "$FILE" ]; then
+  echo "Error: File not found: $FILE" >&2
+  exit 1
+fi
+
+# Extract frontmatter
+FRONTMATTER=$(sed -n '/^---$/,/^---$/{ /^---$/d; p; }' "$FILE")
+
+if [ -z "$FRONTMATTER" ]; then
+  echo "Error: No frontmatter found in $FILE" >&2
+  exit 1
+fi
+
+# If no field specified, output all frontmatter
+if [ -z "$FIELD" ]; then
+  echo "$FRONTMATTER"
+  exit 0
+fi
+
+# Extract specific field
+VALUE=$(echo "$FRONTMATTER" | grep "^${FIELD}:" | sed "s/${FIELD}: *//" | sed 's/^"\(.*\)"$/\1/' | sed "s/^'\\(.*\\)'$/\\1/")
+
+if [ -z "$VALUE" ]; then
+  echo "Error: Field '$FIELD' not found in frontmatter" >&2
+  exit 1
+fi
+
+echo "$VALUE"
+exit 0