The background_proc() method creates temporary files for stdout/stderr on Windows but never deletes them, leaving orphaned files on the filesystem.

Changes:

• Track temp files: Added $temp_files property to store file paths for cleanup
• Clean on error: Delete temp files immediately when process fails to start
• Clean on success: Delete temp files in AfterScenario hook when process terminates
• Helper method: Extracted cleanup_temp_files() to handle safe deletion with existence checks

Implementation:

// Create and track temp files
$stdout_file = tempnam( sys_get_temp_dir(), 'behat-stdout-' );
$stderr_file = tempnam( sys_get_temp_dir(), 'behat-stderr-' );
// ...
$this->temp_files[] = $stdout_file;
$this->temp_files[] = $stderr_file;

// Cleanup helper with existence check
private function cleanup_temp_files( ...$files ): void {
    foreach ( $files as $file ) {
        if ( file_exists( $file ) ) {
            unlink( $file );
        }
    }
}

Temp files now cleaned up regardless of process success/failure.

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