Add macos-26 runner to CI

[mvandeberg]

Summary by CodeRabbit

• Tests
  • Expanded macOS test matrix to 3 configurations including macOS 26 and macOS 15
  • Enhanced validation with multiple Apple-Clang compiler settings and sanitizer configurations

[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

The pull request extends the macOS CI testing matrix from 2 to 3 configurations. It promotes the existing macOS 15 asan/ubsan configuration to macOS 26, introduces a new macOS 15 configuration without asan/ubsan, and removes the build-cmake flag from the macOS 14 entry.

Changes

Cohort / File(s)	Summary
CI Workflow Configuration .github/workflows/ci.yml	Expanded macOS CI matrix by migrating the macOS 15 asan/ubsan config to macOS 26, adding a new macOS 15 config (Release build, CMake enabled, C++20 with experimental-library), and removing build-cmake flag from macOS 14.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 Hops of joy, the CI expands so wide,

macOS 26 steps forth with asan's pride,

While new fifteen hops in, fresh and keen,

Three configurations, the finest seen,

Testing all the gardens, left and right! 🌱

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.26%. Comparing base (fc73eee) to head (2970acb).
⚠️ Report is 44 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #155      +/-   ##
===========================================
+ Coverage    80.33%   82.26%   +1.92%     
===========================================
  Files           65       70       +5     
  Lines         5635     5876     +241     
===========================================
+ Hits          4527     4834     +307     
+ Misses        1108     1042      -66     

see 104 files with indirect coverage changes

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