Windows `npx` command resolution failure breaks tsx/ts-node fallback

[Perlmint]

gaji version

1.1.0

Installation method

npm (npx gaji)

Operating system

Windows

Bug description

On Windows, npx is not exposed as a plain executable but instead as npx.cmd and npx.ps1. As a result, Command::new("npx") fails to resolve the command and returns an error.
Using Command::new("npx.cmd") works correctly on Windows.

Steps to reproduce

1. Run gaji build with QuickJS incompatible workflow code on Windows

Expected behavior

tsx/ts-node fallback runs without problem

Actual behavior

Neither tsx nor ts-node is available

Workflow file (if applicable)

Additional context

No response