Add a Roadmap section to README.md and CLAUDE.md describing the two
still-to-be-written lib/ tools (tro_export.py, scl_gen.py) that will
turn the annotated CAD drawing into a JSON layout model and then into
TIA-Portal-importable SCL, including the --skip-json shortcut.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>