chore: ignore *.csproj.lscache LSP artifacts

[mpaulosky]

Adds *.csproj.lscache pattern to .gitignore to suppress 16 untracked LSP artifact files generated by the C# language server.

These files are build/IDE artifacts and should never be committed.

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🤖 Ralph (Work Monitor) — housekeeping chore

[Copilot]

Copilot wasn't able to review any files in this pull request.

[github-actions]

🏗️ PR Added to Squad Triage Queue

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[github-actions]

Test Results Summary

2 365 tests  ±0   2 365 ✅ ±0   1m 23s ⏱️ ±0s
   10 suites ±0       0 💤 ±0 
   10 files   ±0       0 ❌ ±0 

Results for commit 4bb44ce. ± Comparison against base commit d6af815.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.52%. Comparing base (d6af815) to head (4bb44ce).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #261   +/-   ##
=======================================
  Coverage   78.52%   78.52%           
=======================================
  Files         228      228           
  Lines        8481     8481           
  Branches     1166     1166           
=======================================
  Hits         6660     6660           
  Misses       1284     1284           
  Partials      537      537           

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