Update X tool registration to use x_config.yaml and remove user note tools
- Switch from config_loader.get_letta_config() to x.get_x_letta_config()
- Remove x_user_note_* tools from registration (attach/detach remain)
- Fixes X bot tool registration to use correct configuration file
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>