Co-authored-by: Renovate Bot <renovate@whitesourcesoftware.com>

* fix(engine): preserve injected property values

Keep SourceGeneratedViewer output opt-in so normal builds do not fail on stale generated files.

Closes #5753

* fix(engine): tighten property injection guard

Share the already-populated check between source-generated and reflection paths, and only skip reference-type properties.

Remove the unrelated SDK roll-forward change from this PR.

* test(engine): polish issue 5753 coverage

Mark the value-type regression for engine-test sweeps and use the synchronous data-source abstraction.

) (#5767)

* fix(assertions): gate IsEqualTo<TValue, TOther> overload to net9+ (#5765)

The IsEqualTo<TValue, TOther> / IsNotEqualTo<TValue, TOther> overloads added
in 1.40.0 (#5751) rely on [OverloadResolutionPriority(-1)] to lose to the
source-generated single-generic overload when both apply. That attribute is
only honored by C# 13+ and only present in System.Runtime.CompilerServices
on .NET 9+. On the net8.0 / netstandard2.0 builds of TUnit.Assertions,
Polyfill silently drops the attribute and every same-type IsEqualTo call
becomes ambiguous (CS0121), breaking effectively every existing test suite.

Gating the new overloads behind #if NET9_0_OR_GREATER means net8.0 /
netstandard2.0 consumers fall back to the original well-defined overload
with no contest. net9.0+ consumers using a modern SDK keep the wrapper
Value Object support introduced in #5720.

Public API snapshots for net8.0 and netstandard2.0 (Net4_7) updated to
drop the gated overloads. Issue5720Tests gated to match. Added Issue5765
regression test covering same-type IsEqualTo across enum/primitive/record.

* chore: trim verbose comments and test names from #5765 fix

Per simplify review:
- Shrunk the gate-rationale comment in ImplicitConversionEqualityExtensions
  from 9 lines to 4 — keep the WHY, drop the narration.
- Replaced the duplicate gate-rationale block in Issue5720Tests with a
  one-line pointer to the source file.
- Dropped the redundant XML <summary> on Issue5765Tests (sibling
  IssueNNNNTests files don't carry one) and the "_Compiles_And_Passes"
  suffix on each test name.