On macOS, zsh users may not have ~/.zshrc if they haven't customized
their shell yet. The installer would silently fail to add ~/.local/bin
to PATH, causing 'hermes: command not found' after installation.
- Check ~/.zprofile as fallback for zsh users (macOS login shell config)
- Create ~/.zshrc if neither config file exists
Cherry-picked from PR #2315 by erhnysr.
Co-authored-by: erhnysr <erhnysr@users.noreply.github.com>
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