Spec conformance: Section 5 — Validation

[craigsmitham]

Summary

Add a dedicated GraphZen.SpecConformance.Tests project with Section 5 (Validation) conformance coverage mapped to the GraphQL spec working draft.

• 28 conformance classes covering every validation subsection (5.1.1 through 5.8.5)
• 161 tests: 82 passing, 79 skipped with explicit gap descriptions
• Rule-specific ExpectValid/ExpectErrors API with ToDeepEqual error assertions
• SpecSection trait attribute with hierarchical filtering (SpecSection=5, 5.3, 5.3.3)
• Coverage manifest + reflection-based coverage test ensuring every subsection has a class
• Authoring guidance in test/GraphZen.SpecConformance.Tests/CLAUDE.md

Running

dotnet test test/GraphZen.SpecConformance.Tests/                             # all conformance tests
dotnet test --filter "SpecSection=5"                                          # Chapter 5
dotnet test --filter "SpecSection=5.3.3"                                      # one subsection
dotnet test --filter "FullyQualifiedName~ValidationCoverageTests"            # coverage check

Related

• Conformance gaps tracked in Finish ignored validation conformance gaps from spec suite #58
• Remaining spec sections: Spec conformance: Section 2 — Language #60 (Language), Spec conformance: Section 3 — Type System #61 (Type System), Spec conformance: Section 4 — Introspection #62 (Introspection), Spec conformance: Section 6 — Execution #63 (Execution), Spec conformance: Section 7 — Response #64 (Response)

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