remove unused constraints

[koenbeuk]

Before: expressive overloads would only bind to reference types. that was a bad copy/paste. Now it binds properly to value types as well

[codecov]

Codecov Report

❌ Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
.../Extensions/ExpressiveQueryableEfCoreExtensions.cs	0.00%	20 Missing ⚠️

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[Copilot]

Pull request overview

This PR removes unintended where TEntity : class constraints from EF Core expressive extension stubs so that delegate-based expressive overloads can bind to value-type projections (e.g., after Select(o => o.Price)), aligning the stubs’ generic constraints with EF Core’s actual queryable extension method constraints.

Changes:

• Removed incorrect reference-type (class) constraints from several EF Core async stub overloads (e.g., SumAsync, AverageAsync, FirstAsync, MinAsync, MaxAsync) and from TagWith/TagWithCallSite.
• Added integration tests exercising async methods over value-type projections (including a “modern syntax” switch expression).
• Added a reflection-based test to detect “over-constrained” stubs where Expressive stubs have a class constraint but EF Core targets do not.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
tests/ExpressiveSharp.EntityFrameworkCore.IntegrationTests/Tests/StubSignatureTests.cs	Adds a reflection-based guard test to catch overly restrictive class constraints on expressive EF Core stubs.
tests/ExpressiveSharp.EntityFrameworkCore.IntegrationTests/Infrastructure/AsyncQueryableTestBase.cs	Adds integration tests proving async methods work over value-type projections and with modern syntax inside the selector/predicate.
src/ExpressiveSharp.EntityFrameworkCore/Extensions/ExpressiveQueryableEfCoreExtensions.cs	Removes incorrect where TEntity : class constraints so stubs bind correctly for value-type element queries.

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