fix: amazon q ignores rules for other os, so adding fallback

[laileni-aws]

Problem

• AmazonQ Ignores Rules aws-toolkit-vscode#8540

Solution

• fix: amazon q ignores rules for other os, so adding fallback #2639

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 91.04478% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.25%. Comparing base (c8022fe) to head (f716af1).

Files with missing lines	Patch %	Lines
...r/agenticChat/context/additionalContextProvider.ts	91.04%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2663      +/-   ##
==========================================
+ Coverage   60.22%   60.25%   +0.03%     
==========================================
  Files         279      279              
  Lines       66091    66157      +66     
  Branches     4184     4195      +11     
==========================================
+ Hits        39802    39865      +63     
- Misses      26207    26209       +2     
- Partials       82       83       +1     

Flag	Coverage Δ
unittests	60.25% <91.04%> (+0.03%)	⬆️

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