feat: FluentValidation interceptor for stream queries

[Copilot]

• Create FluentValidationStreamQueryInterceptor<TQuery, TResponse> in src/NetEvolve.Pulse.FluentValidation/Interceptors/
• Register IStreamQueryInterceptor<,> → FluentValidationStreamQueryInterceptor<,> as Scoped in FluentValidationExtensions.AddFluentValidation()
• Add unit tests for the new interceptor in tests/NetEvolve.Pulse.Tests.Unit/FluentValidation/Interceptors/FluentValidationStreamQueryInterceptorTests.cs
• Add unit tests for the new registration in FluentValidationExtensionsTests.cs
• Fix S4456: Split HandleAsync into non-iterator wrapper (parameter validation) + private HandleCoreAsync iterator (async validation + yield)
• Build and verify: all tests pass

[samtrion]

@copilot fix pipeline errors/warnings

[Copilot]

@copilot fix pipeline errors/warnings

Fixed in 75f90d7. The CI was failing due to SonarAnalyzer S4456 — HandleAsync was an async IAsyncEnumerable method that mixed parameter validation with iteration. Split it into a non-iterator HandleAsync wrapper (for ArgumentNullException.ThrowIfNull) that returns a private HandleCoreAsync async iterator (for validation + yield), matching the pattern used by HttpCorrelationStreamQueryInterceptor.

[codecov]

Codecov Report

❌ Patch coverage is 95.83333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 91.42%. Comparing base (bb34053) to head (b2dcd26).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...rceptors/FluentValidationStreamQueryInterceptor.cs	94.44%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #397      +/-   ##
==========================================
+ Coverage   91.24%   91.42%   +0.17%     
==========================================
  Files         128      129       +1     
  Lines        4524     4548      +24     
  Branches      434      438       +4     
==========================================
+ Hits         4128     4158      +30     
+ Misses        275      268       -7     
- Partials      121      122       +1     

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