test(analyzer): drive every mutation operator through the analyzer end to end

[samtrion]

Summary

• Raises the Integration-project-only coverage of the mutation-testing analyzer from 56.7% to 83.4%, closing the gap flagged for the pre-existing analyzer (as opposed to the new Execution deliverable, which PR feat(execution): add execution-based mutation verification engine #104 already covers).
• Every previously unit-tested-only operator (arithmetic, bitwise, boolean, conditional, equality, logical, nullable/numeric literals, checked/unchecked context, string/LINQ/math method renames, statement removal, collection initializers, the full regex mutation family), plus reachability, equivalence classification and the test-surface recognizers/generator, is now also driven end to end through the real MutationCoverageAnalyzer / TestSurfaceManifestGenerator pipeline, not just called directly the way the existing Unit suite already does.
• Coverage after this change: Unit 91.6%, Integration 83.4%, combined 97.4%.

Test plan

• dotnet build FrameShift.slnx - 0 warnings, 0 errors
• dotnet test FrameShift.slnx - 31,678 tests passed across all 8 target frameworks (net6.0-net10.0, net472/net48/net481)
• Verified Integration-only, Unit-only and combined coverage numbers with a real dotnet test --coverage + ReportGenerator run

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.45%. Comparing base (4ae3c20) to head (404569b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #105      +/-   ##
==========================================
+ Coverage   95.36%   95.45%   +0.09%     
==========================================
  Files          93       93              
  Lines        6233     6233              
  Branches     1340     1340              
==========================================
+ Hits         5944     5950       +6     
+ Misses        128      127       -1     
+ Partials      161      156       -5     

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