Update documentation for cross-platform features
- README.md: Updated to reflect Bluesky + X dual-platform operation
- Added platform-specific tool management documentation
- Enhanced feature descriptions with new capabilities
- Updated installation and usage instructions for both platforms
- Added troubleshooting guidance for platform switching
- TOOL_CHANGELOG.md: Complete rewrite with latest changes
- Documents platform-specific tool management system
- Added new tools: fetch_webpage, annotate_ack, create_whitewind_blog_post
- Enhanced features: reply structure fix, #voidstop keyword support
- Migration guidance for users updating to new features
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Co-Authored-By: Claude <noreply@anthropic.com>