Spec conformance: Section 6 — Execution

[craigsmitham]

Scope

Section 6 — Execution. Covers executing requests, coercing variable values, evaluating operations (query, mutation, subscription), evaluating selection sets, evaluating fields, value completion, and error handling. 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 runtime execution behavior and will almost certainly need a different harness (resolvers, data sources, result assertions).

Stage 1 — Design

• Read spec Section 6, extract all subsections and normative statements
• Review graphql-js test coverage for execution (~/Code/graphql/graphql-js/src/execution/)
• Determine test infrastructure needs (resolver setup, execution harness, result/error assertions)
• 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