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/github-dev-clean-gone-branches.md

@@ -0,0 +1,44 @@
+---
+description: Clean up local branches deleted from remote
+---
+
+# Clean Gone Branches
+
+Remove local git branches that have been deleted from remote (marked as [gone]).
+
+## Instructions
+
+Run the following commands in sequence:
+
+1. **Update remote references:**
+   ```bash
+   git fetch --prune
+   ```
+
+2. **View branches marked as [gone]:**
+   ```bash
+   git branch -vv
+   ```
+
+3. **List worktrees (if any):**
+   ```bash
+   git worktree list
+   ```
+
+4. **Remove worktrees for gone branches (if any):**
+   ```bash
+   git branch -vv | grep '\[gone\]' | awk '{print $1}' | sed 's/^[*+]*//' | while read -r branch; do
+     worktree=$(git worktree list | grep "\[$branch\]" | awk '{print $1}')
+     if [ -n "$worktree" ]; then
+       echo "Removing worktree: $worktree"
+       git worktree remove --force "$worktree"
+     fi
+   done
+   ```
+
+5. **Delete gone branches:**
+   ```bash
+   git branch -vv | grep '\[gone\]' | awk '{print $1}' | sed 's/^[*+]*//' | xargs -I {} git branch -D {}
+   ```
+
+Report the results: list of removed worktrees and deleted branches, or notify if no [gone] branches exist.