Harden draw.io CLI harness

[getmored-create]

Summary

• harden the draw.io harness for Windows-friendly CLI usage
• add a module entry point and remove non-compliant export fallback behavior
• add regression coverage and refresh TEST.md with the passing test run

Validation

• python -m pip install -e .
• python -m pytest cli_anything/drawio/tests/ -v --tb=no

[sehawq]

Thanks for the PR! There’s one thing to note:

render_or_save no longer contains a fallback function; it now only calls the render function, but the documentation still refers to it as a “backward-compatible wrapper.” If someone has relied on this fallback function, this is a breaking change. Please either update the documentation or note this as a breaking change in the notes.

A quick question: Do E2E tests skip smoothly when the draw.io CLI isn’t installed? If they don’t, CI/dev environments could break.

Thanks!