Previously, setupClaudeSettings would silently create an empty settings
map when json.Unmarshal failed, then write just a prompt field to the
file - destroying all existing user settings (permissions, hooks, etc).
Now returns a clear error asking the user to fix the JSON syntax
manually, preserving their original file contents.
Also properly handles permission errors when reading existing files.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Jimmy Stridh <jimmystridh@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>
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