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Bug: GraphQL field arguments with @deprecated not showing deprecationReason in introspection

Bug: GraphQL field arguments with @deprecated not showing deprecationReason in introspection: a task in LegoFlow-SWE (Harbor dataset). When a field argument is annotated with @deprecated(reason: "...") , querying the schema via type should expose a deprecationReason for that argument. However…

The task

When a field argument is annotated with `@deprecated(reason: "...")`, querying the schema via `__type` should expose a `deprecationReason` for that argument. However, introspection currently reports `null` for the `deprecationReason` of all arguments, even those marked as deprecated.

Part of Lego-X/LegoFlow-SWE.