- pyproject declared build-backend = "setuptools.backends._legacy:_Backend",
which does not exist: `python -m build`, `pip install .` and even
`pip install -e .` died with "Backend ... is not available". It is
setuptools.build_meta now.
- the wheel and sdist carried only the Python packages, and _default_web_dir()
resolved <site-packages>/../frontend, so an installed server started fine but
answered every static request with 404. setup.py's build_py now copies the
checkout's frontend/ into simtrace_analyser/web/ inside the build (the PWA's
tests excluded), and _default_web_dir() prefers that packaged copy, falling
back to <repo>/frontend for source and editable runs. The source directory
is resolved from setup.py (so an sdist build works) and a missing frontend/
fails the build loudly instead of shipping a package without its UI.
- MANIFEST.in grafts frontend/ (with the READMEs, the udev rule and the four
launch scripts) into the sdist, so a wheel built from the sdist has the PWA.
- README (EN/RU): an install-from-a-release section (pipx/pip with the wheel,
the direct release URL for pip) and the --web-dir default documented as the
bundled PWA, or <repo>/frontend from source.
- tests/test_packaging.py pins the packaged-first resolution (including the
empty-directory fallback), the source checkout default, the real build
backend, the manifest graft and setup.py's bundling.
- verified: a fresh venv install from the wheel and from the sdist serve
GET / (200, byte-identical index.html, PWA v2.7.10) out of
site-packages/simtrace_analyser/web; an editable install still resolves
<repo>/frontend. 547 Python + 80 Node tests.
