- Add comprehensive PTY documentation with examples:
- Basic usage
- Multiple PTY streams (stdin/stdout/stderr)
- Custom terminal dimensions (width/height)
- Colored output from git, grep, etc.
- Platform support table
- Limitations section
- Make PTY fall back to pipe on Windows (instead of error)
- Add spawnSync error for PTY (not supported)
- Add tests for spawnSync PTY error
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Co-Authored-By: Claude <noreply@anthropic.com>
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