Prefer built-in platform parsers over manual argument scanning

When reviewing or fixing command-line argument handling, use Node’s built-in argument parser rather than maintaining manual argv token scans. Preserve the established selection semantics with explicit regression coverage: valid CLI values override environment values, while missing, empty, or option-like values after a flag do not get consumed and fall back to the environment or undefined. Before committing, run focused tests for parser edge cases and related configuration/version behavior.