Summary

• remove the standalone TraversalContext and traversal forwarding methods from ValidationContext
• keep validation traversal state directly in OperationValidator and resolve output types from their AST owners
• track the current operation directly, including during fragment retraversal
• replace stack-mechanics tests with behavioral coverage for roots, fragments, query paths, nested inputs, directives, and unresolved arguments

Testing

• ./gradlew test testng jacocoTestReport (5,927 tests)
• ./gradlew check -x test -x testng
• local CI-equivalent coverage comparison reports no per-class regressions