Background PID Tracking Not Supported on Windows

[akramcodez]

Description

ShellTool attempts to detect PIDs for background commands, but the logic relies on pgrep, which is explicitly skipped on Windows:

if (os.platform() !== 'win32') {
  // pgrep logic
}

As a result, the backgroundPids field is always empty on Windows, even when background processes are successfully started using start /b.

Impact

• Windows users cannot verify whether a background process started
• The agent cannot capture PIDs needed to stop or manage spawned processes