- Add error checking for os.Setenv and io operations in test files
- Use anonymous functions in defer to ignore errors from os.Remove, os.Setenv, etc.
- Minor formatting and consistency fixes in tests and client code
- Introduce newGrokClient and gitRun vars to allow mocking in tests.
- Refactor commit, commitmsg, history, prdescribe, and review cmds into separate run funcs.
- Update docs, lint, and review to use newGrokClient.
- Add comprehensive unit tests in run_test.go covering happy paths, errors, and edge cases.
- Expand grok client tests with SSE server mocks for Stream* methods.
