Add generic TestLogger<T> for strongly-typed logging tests

[ncipollina]

Summary

• Add TestLogger<T> class that inherits from TestLogger and implements ILogger<T>
• Enables unit tests to verify logging behavior for strongly-typed loggers
• All existing extension methods work automatically through inheritance

Test plan

• Build compiles successfully
• All existing tests pass
• New tests verify generic logger functionality
• Generic logger can be used where ILogger<T> is expected

🤖 Generated with Claude Code

[Copilot]

Pull Request Overview

This PR introduces a generic TestLogger<T> for strongly-typed logging tests and adds a suite of unit tests to verify its behavior.

• Add TestLogger<T> class inheriting from TestLogger and implementing ILogger<T>
• Create GenericTestLoggerTests.cs to cover core functionality, extension methods, clearing entries, shared state, and ILogger<T> compatibility

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/LayeredCraft.StructuredLogging/Testing/TestingExtensions.cs	Added generic TestLogger<T> class with XML docs
test/LayeredCraft.StructuredLogging.Tests/Testing/GenericTestLoggerTests.cs	New tests validating TestLogger<T> behavior

Comments suppressed due to low confidence (1)

test/LayeredCraft.StructuredLogging.Tests/Testing/GenericTestLoggerTests.cs:1

• The test file is missing the using Xunit; and using FluentAssertions; directives, which are required for the [Fact] attribute and Should() extension methods to compile.

using Microsoft.Extensions.Logging;