Introduces structured error responses that pair error messages with user-friendly
troubleshooting hints. This improves error handling across the codebase and
provides better guidance to users when things go wrong.
Key changes:
- Add ErrorResponse type with Err and Hint fields
- Update client to handle structured errors in streaming and regular responses
- Add specific error handling for common cases like missing models
- Improve CLI output to clearly show both errors and hints
- Add comprehensive test coverage for new error formats
Maintains backward compatibility with existing error handling while making error
messages more helpful and actionable for users.
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