initial attempt at Python 3.14 support

[jGaboardi]

• initial attempt at Python 3.14 support
• xref revisit spec000 minimal support versions – 2025-10 #715

[jGaboardi]

• Not there yet.
• We knew that numba would be the bottleneck from previous experience, so this is no big surprise

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.2%. Comparing base (4037c70) to head (6b31f09).
⚠️ Report is 122 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #716     +/-   ##
=======================================
+ Coverage   97.4%   98.2%   +0.9%     
=======================================
  Files         26      26             
  Lines       4328    4215    -113     
=======================================
- Hits        4214    4141     -73     
+ Misses       114      74     -40     

see 3 files with indirect coverage changes

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