Replaces manual working directory save/restore patterns
with Go's built-in `t.Chdir()` helper across 23 test files.
The manual pattern involved calling `os.Getwd()` to save
the original directory, using `defer os.Chdir(origWd)` for
restoration, and manually handling errors during directory
changes. This boilerplate has been replaced with single
`t.Chdir(path)` calls that handle cleanup automatically.
The `t.Chdir()` method automatically restores the working
directory when the test completes, eliminating the need for
manual defer statements and error handling.
Total:
~75 instances replaced (assuming Claude's math is right)
Co-authored-by: Claude <noreply@anthropic.com>
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