chore(workflow): update CI test matrix & use macos-26

[erisu]

• Update CI Test Matrix testing job
• Split CodeQL to its own job in the CI workflow
• Use macos-26

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.32%. Comparing base (1edf705) to head (d4c3e1e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #164   +/-   ##
=======================================
  Coverage   97.32%   97.32%           
=======================================
  Files          51       51           
  Lines       10865    10865           
=======================================
  Hits        10574    10574           
  Misses        291      291           

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