Export Python symbols globally for pymodule

[knoepfel]

Load pymodule Phlex module with RTLD_GLOBAL flag to expose Python symbols for loading (e.g.) NumPy.

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Credit to Claude Sonnet 4.5 for assistance

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

❌ Your project status has failed because the head coverage (75.81%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

@@            Coverage Diff             @@
##             main     #253      +/-   ##
==========================================
+ Coverage   75.43%   75.81%   +0.38%     
==========================================
  Files         124      124              
  Lines        2902     2898       -4     
  Branches      507      506       -1     
==========================================
+ Hits         2189     2197       +8     
+ Misses        492      486       -6     
+ Partials      221      215       -6     

Flag	Coverage Δ
unittests	75.81% <100.00%> (+0.38%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
phlex/app/load_module.cpp	85.71% <100.00%> (+0.71%)	⬆️
plugins/python/src/pymodule.cpp	60.81% <ø> (+0.81%)	⬆️

... and 5 files with indirect coverage changes

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