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/linear-tools-setup.md

@@ -0,0 +1,74 @@
+---
+description: Configure Linear OAuth authentication
+---
+
+# Linear Tools Setup
+
+**Source:** [Linear MCP Docs](https://linear.app/docs/mcp)
+
+Check Linear MCP status and configure OAuth if needed.
+
+## Step 1: Test Current Setup
+
+Try listing teams using `mcp__linear__list_teams`.
+
+If successful: Tell user Linear is configured and working.
+
+If fails with authentication error: Continue to Step 2.
+
+## Step 2: OAuth Authentication
+
+Linear uses OAuth - no API keys needed. Tell the user:
+
+```
+Linear MCP uses OAuth authentication.
+
+To authenticate:
+1. Run the /mcp command in Claude Code
+2. Find the "linear" server in the list
+3. Click "Authenticate" or similar option
+4. A browser window will open
+5. Sign in to Linear and authorize access
+```
+
+## Step 3: Complete OAuth Flow
+
+After user clicks authenticate:
+
+- Browser opens to Linear authorization page
+- User signs in with their Linear account
+- User approves the permission request
+- Browser shows success message
+- Claude Code receives the token automatically
+
+## Step 4: Verify Setup
+
+Try listing teams again using `mcp__linear__list_teams`.
+
+If successful: Linear is now configured.
+
+## Troubleshooting
+
+If OAuth fails:
+
+```
+Common fixes:
+1. Clear browser cookies for linear.app
+2. Try a different browser
+3. Disable browser extensions
+4. Re-run /mcp and authenticate again
+5. Restart Claude Code and try again
+```
+
+## Alternative: Disable Plugin
+
+If user doesn't need Linear integration:
+
+```
+To disable this plugin:
+1. Run /mcp command
+2. Find the linear server
+3. Disable it
+
+This prevents errors from missing authentication.
+```