Spec conformance: Section 7 — Response

[craigsmitham]

Scope

Section 7 — Response. Covers response format (data, errors, extensions), serialization, and error result format. Subsections TBD during design.

Context

This is part of the phased spec conformance effort started in #57. Phase 1 (Section 5 — Validation) is complete and established conventions documented in test/GraphZen.SpecConformance.Tests/CLAUDE.md. Phase 1 patterns were designed around validation rules — this section covers output serialization and response shape, which will likely need different infrastructure.

Stage 1 — Design

• Read spec Section 7, extract all subsections and normative statements
• Review graphql-js test coverage for response format
• Determine test infrastructure needs (response serialization assertions, JSON comparison helpers)
• Determine class/folder structure and naming
• Determine how implementation gaps should be expressed
• Update test/GraphZen.SpecConformance.Tests/CLAUDE.md with patterns and infrastructure decisions for this section
• Update this issue with the design below

Subsections

To be filled in during design.

Infrastructure

To be filled in during design.

Open Questions

To be filled in during design.

Stage 2 — Implementation

• Add manifest entries
• Create conformance classes
• PR