Bump version to 1.9.4 for NumPy 2 / Linux sdist fix

[IncubatorShokuhou]

Target: this bump is meant for upstream CyanideCN/PyCINRAD. Open the cross-repo PR from:

https://github.com/CyanideCN/PyCINRAD/compare/master...IncubatorShokuhou:PyCINRAD:cursor/numpy2-linux-build-859a?expand=1

(The automation here can only open a PR on this fork; the branch is already pushed and is 1 commit ahead of upstream master.)

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Why

#147 (94adb2b) already fixed Linux source builds:

• add pyproject.toml with setuptools / numpy / cython build-system requires
• always Cythonize .pyx (no vendored .c fallback)

That is unreleased. Git master is still 1.9.3. PyPI latest is also 1.9.3 (2026-01-02), which predates the CyanideCN#147 merge (2026-05-26). On Linux there are no manylinux wheels, so pip install cinrad still downloads the broken sdist.

This PR only bumps 1.9.3 → 1.9.4 in the same three places as previous releases (cinrad/__init__.py, setup.py, docs/conf.py) so a tagged PyPI release can ship the fix. No functional code changes. 1.9.4 would also include already-merged CyanideCN#148 and CyanideCN#149.

PyPI still broken (verified)

python3 -m venv /tmp/pypi-broken && . /tmp/pypi-broken/bin/activate
pip install 'numpy>=2,<3'
pip install cinrad==1.9.3

FAIL (pypi_install_exit=1):

Getting requirements to build wheel did not run successfully.
ModuleNotFoundError: No module named 'numpy'

PyPI 1.9.3 files: Windows cp310–cp314 wheels + cinrad-1.9.3.tar.gz only. No Linux wheel.

Current master works (verified on Linux / Python 3.12 / NumPy 2.5.3)

HEAD tested: ca9ccd9 (use fmax to calc (#148)), which includes CyanideCN#147.

A. Isolated python -m build (sdist + wheel)

Clean venv with only build (no numpy). PEP 517 isolation installed cython==3.3.0, numpy==2.5.3, setuptools==84.0.0.

python3 -m venv /tmp/build-env
/tmp/build-env/bin/pip install build
/tmp/build-env/bin/python -m build

PASS — cinrad-1.9.3.tar.gz + cinrad-1.9.3-cp312-cp312-linux_x86_64.whl. Sdist contains pyproject.toml; setup.py uses ext_suffix = ".pyx".

B. Install wheel into a clean NumPy 2 venv

python3 -m venv /tmp/np2-wheel
/tmp/np2-wheel/bin/pip install 'numpy>=2,<3' pytest
/tmp/np2-wheel/bin/pip install --no-deps dist/cinrad-1.9.3-cp312-cp312-linux_x86_64.whl
# plus runtime deps: xarray scipy matplotlib cartopy pyshp vanadis metpy cinrad_data

From a directory outside the repo (so sys.path does not pick up the source tree):

Check	Result
import cinrad	PASS (1.9.3, site-packages; _utils / _unwrap_2d .so loaded)
pytest test/	PASS 10 passed
VIL / echo_top / unwrap_2d smoke	PASS (cython VIL/ET match expected + py fallback; unwrap finite)

C. pip install the built sdist (Linux-from-source path)

python3 -m venv /tmp/np2-sdist
/tmp/np2-sdist/bin/pip install 'numpy>=2,<3' pytest
/tmp/np2-sdist/bin/pip install dist/cinrad-1.9.3.tar.gz   # PEP 517 isolated rebuild

PASS — wheel rebuilt; import cinrad OK; pytest 10 passed; extension smoke OK on NumPy 2.5.3.

Workaround until 1.9.4 is on PyPI

pip install git+https://github.com/CyanideCN/PyCINRAD.git

or pip install . from a clone (uses pyproject.toml).

Request

Please tag v1.9.4 and upload a new sdist (and wheels if convenient). Linux users currently cannot pip install cinrad under modern pip + NumPy 2. I did not add a CHANGELOG file because the repo has never kept one.