## CHANGES
- Add case-insensitive vendor lookup in VendorsManager
- Implement model name normalization in GetChatter method
- Add FilterByVendor method with case-insensitive matching
- Add FindModelNameCaseInsensitive helper for model queries
- Update group/item comparison to use case-insensitive checks
- Store vendors with lowercase keys internally
- Add comprehensive tests for case-insensitive functionality
- Fix vendor filtering for model listing command
## CHANGES
- Update `GetDefaultConfigPath` to return error alongside path
- Add proper error handling in flags initialization
- Include debug logging for config path failures
- Move channel close to defer in dryrun SendStream
- Return wrapped errors with context messages
- Handle non-existent config as valid case
## CHANGES
- Map both short and long flags to yaml tags
- Add support for short flag parsing with dashes
- Implement default ~/.fabric.yaml config file detection
- Fix think block suppression in dry run mode
- Add think options to dry run output formatting
- Refactor dry run response construction into helper method
- Return actual response content from dry run client
- Create utility function for default config path resolution
## CHANGES
- Move domain types from common to domain package
- Move utility functions from common to util package
- Update all import statements across codebase
- Reorganize OAuth storage functionality into util package
- Move file management functions to domain package
- Update test files to use new package structure
- Maintain backward compatibility for existing functionality
