chore(anthropic_token_limiter.py): remove import of fix_anthropic_message_content as it is no longer needed
test: add unit tests for has_tool_use and is_tool_pair functions to ensure correct functionality
test: enhance test coverage for anthropic_trim_messages with tool use scenarios to validate message handling
feat(main.py): add DEFAULT_MODEL constant to centralize model configuration
feat(main.py): enhance logging and error handling for better debugging
feat(main.py): implement state_modifier for managing token limits in agent state
feat(anthropic_token_limiter.py): create utilities for handling token limits with Anthropic models
feat(output.py): add print_messages_compact function for debugging message output
test(anthropic_token_limiter.py): add unit tests for token limit utilities and state management