Fix user_note_* tools NameError for cloud execution
- Fixed user_note_append, user_note_replace, user_note_set, user_note_view functions
- Changed from get_letta_client() to inline Letta client creation for cloud compatibility
- Also updated attach/detach functions to handle both local and cloud execution
- Removed logger.debug call that wouldn't work in cloud environment
- All functions now create Letta client inline using environment variables
This fixes the critical failure void reported where user_note_* tools were non-functional
due to NameError when get_letta_client couldn't import config_loader in cloud.
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Co-Authored-By: Claude <noreply@anthropic.com>