Enable examples in Windows CI build

[PJK]

Summary

• Add -DWITH_EXAMPLES=ON to the Windows MSVC CI job so that Windows-specific build issues in examples are caught

Test plan

• Windows CI (build-and-test-win) passes

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (375e10b) to head (af30c3e).
⚠️ Report is 29 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #395   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           20        20           
  Lines         1663      1663           
=========================================
  Hits          1663      1663           

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