Add policy based shifting

[mborland]

Closes: #22
Closes: #26
Closes: #27

[codecov]

Codecov Report

❌ Patch coverage is 94.42724% with 18 lines in your changes missing coverage. Please review.
✅ Project coverage is 96.8%. Comparing base (434a46f) to head (4e8a58a).
⚠️ Report is 7 commits behind head on develop.

Files with missing lines	Patch %	Lines
examples/bitwise_ops.cpp	65.2%	0 Missing and 15 partials ⚠️
...ost/safe_numbers/detail/unsigned_integer_basis.hpp	96.5%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop     #42     +/-   ##
=========================================
- Coverage     97.0%   96.8%   -0.1%     
=========================================
  Files           85      85             
  Lines         4871    5183    +312     
  Branches      1547    1642     +95     
=========================================
+ Hits          4721    5015    +294     
- Misses         121     124      +3     
- Partials        29      44     +15     

Files with missing lines	Coverage Δ
test/test_unsigned_bitwise_ops.cpp	100.0% <100.0%> (ø)
...ost/safe_numbers/detail/unsigned_integer_basis.hpp	95.3% <96.5%> (+0.2%)	⬆️
examples/bitwise_ops.cpp	77.4% <65.2%> (-12.8%)	⬇️

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[cppalliance-bot]

An automated preview of the documentation is available at https://42.safe-numbers.prtest3.cppalliance.org/libs/safe_numbers/doc/html/index.html

If more commits are pushed to the pull request, the docs will rebuild at the same URL.

2026-02-12 15:58:52 UTC