Derive __version__ from package metadata

[milton-minervino]

pyproject.toml now uses setuptools-scm for dynamic versioning, but shapash/__version__.py still hard-coded VERSION = (2, 9, 0). As a result, shapash.__version__ stayed at 2.9.0 whatever version was actually built and published.

Changes

• shapash/__version__.py: read the version with importlib.metadata.version("shapash"), so it always matches the version setuptools-scm puts on the wheel. When the package isn't installed (running from a source tree), it falls back to "0+unknown".
• tests/unit_tests/utils/test_load_smartpredictor.py: the major/minor version-mismatch tests now patch shapash_version to a fixed value instead of reading the installed version, so they behave the same whether or not shapash is installed.
• add unit test test_version.py to cover the file.

Impact

• The SmartPredictor manifest (shapash_version) and its load-time compatibility check now use the real version instead of the stale 2.9.0.
• The post-publish smoke test (python -c "import shapash; print(shapash.__version__)") now prints the version that was actually released.
• The "0+unknown" fallback can't be parsed as a version, so in an uninstalled tree the compatibility check is skipped. A fallback like "0.0.0" would have raised a false "Major version mismatch" error there.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.14%. Comparing base (e9acf55) to head (ca0e498).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #799      +/-   ##
===========================================
+ Coverage    80.13%   80.14%   +0.01%     
===========================================
  Files           59       59              
  Lines         7406     7410       +4     
  Branches      1557     1557              
===========================================
+ Hits          5935     5939       +4     
  Misses         902      902              
  Partials       569      569              

Files with missing lines	Coverage Δ
shapash/__version__.py	100.00% <100.00%> (ø)

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