test: add C# chained &&/|| deduplication branch coverage

[github-actions]

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Summary

Adds unit tests for C#'s logical operator chain deduplication (a && b && c counts once, not per pair), mirroring the existing JS/Go/Python/Rust tests for the same behaviour. This was the one language missing this specific regression test, and the corresponding branch in csharpAnalyzer.ts's getComplexityIncrement (the parent-chain short-circuit that returns 0 for inner nodes of a same-operator chain) was previously uncovered.

Tests added

• C#: chained && counts once, not per pair — a && b && c should have complexity 1
• C#: mixed && and || counts each sequence separately — a && b || c should have complexity 2

Test Status

npm run compile   OK (0 errors)
npm run lint      OK (0 warnings)
npm run test:unit OK 217 passing (was 215), 0 failing

Coverage improvement (csharpAnalyzer.ts): branches 77.46% -> 78.32%. All other files unchanged.

Note: the full npm test (VS Code integration test) could not be run in this sandboxed environment due to getaddrinfo EAI_AGAIN update.code.visualstudio.com (no network access to download VS Code) — this is a known environment limitation, not caused by this change.

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Threat detection produced a warning for this pull request output.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.82%. Comparing base (e83bf39) to head (12b763e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #526      +/-   ##
==========================================
+ Coverage   81.76%   81.82%   +0.06%     
==========================================
  Files          13       13              
  Lines        4386     4386              
  Branches      449      450       +1     
==========================================
+ Hits         3586     3589       +3     
+ Misses        799      796       -3     
  Partials        1        1              

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Pull request overview

Adds C# regression coverage for logical-operator complexity deduplication.

Changes:

• Tests chained && as one complexity increment.
• Tests mixed &&/|| as separate sequences.

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