Summary

Add support for specifying a custom tsgo binary path via tsgo.path option. This allows users who manage tsgo externally (e.g., via Nix) to use their own binary instead of the bundled @typescript/native-preview package.

What Changed

• Extended tsgo option to accept boolean | { path: string }
• Added TsgoOptionsResolved interface for internal handling
• Updated runTsgo function to accept custom path parameter
• Added test for custom path functionality

Usage

// Use bundled tsgo (unchanged)
dts({ tsgo: true })

// Use custom tsgo path
dts({ tsgo: { path: '/path/to/tsgo' } })

Backward Compatibility

Existing tsgo: boolean usage remains fully supported.

Follow-up to #163 - implements the tsgo.path option as discussed.