Fix X tool removal when running bsky.py
Added missing X-specific tools to tool_manager.py:
- detach_x_user_blocks
- attach_x_user_blocks
- update_x_user_blocks
- search_x_profile
Also properly categorized core Letta tools vs platform-specific tools.
Now when bsky.py runs, it correctly removes all X-only tools.
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Co-Authored-By: Claude <noreply@anthropic.com>