externum Files

Fixed

• externum file.ext --target bash works for the first time. It previously crashed with list indices must be integers or slices, not str (swallowed by the CLI's broad error handler). Compiler.compile() now returns a dict for single targets, matching what the CLI always expected.
• Unknown --target values raise a clear ValueError instead of silently returning an empty string.

Changed

• Test counts unified to the actual suite size: 366 tests, all green.
• README: the Why? section and a real end-to-end ASCII demo moved to the top; dead TOC anchor removed.

Packaging

• setup.py version bumped from 2.0.0 to 4.0.0 — PyPI will now match the code. (pip install externum currently serves 2.0.0; the 4.0.0 upload follows once the maintainer runs twine upload dist/*.)

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