Update GraphQL Emitter to use GraphQL Mutation Engine#59

Draft

FionaBronwen wants to merge 2 commits intofionabronwen/model-typemapfrom

fionabronwen/emitter-integration

Commits on Jan 23, 2026

feat(graphql): integrate mutation engine and TypeMaps into emitter
FionaBronwen
committed

Commits on Jan 28, 2026

refactor mutator engine usage into a separate pass of the program
FionaBronwen
committed