UpdateRowsWalker raw-SDL substrate absorption

R246 shipped UpdateRowsWalker as a translator over the already-classified InputField permits (the four admitted column carriers ColumnField / CompositeColumnField / ColumnReferenceField / CompositeColumnReferenceField, reached via TableInputType.inputFields()) plus the jOOQ catalog, rather than re-deriving the input-field classification from raw SDL + classloader as the R246 spec’s ideal walk(GraphQLFieldDefinition, JooqCatalog) signature implied. This is the same blast-radius concession R238’s ServiceMethodCallWalker took (translating over a resolved MethodRef.Service rather than reflecting from scratch); re-deriving the @reference FK-join and @nodeId decode resolution inside the walker would have duplicated the substantial classifier in InputFieldResolver / EnumMappingResolver.buildLookupBindings.

A consequence of the concession is that the per-field rules buildLookupBindings enforced for the UPDATE path (list-typed input field, field-level @condition) had to be re-expressed as typed UpdateRowsError arms inside the walker, because the UPDATE-direct path in FieldBuilder.classifyUpdateTableField bypasses resolveInput/buildLookupBindings entirely. Those rules now live in two places (the legacy resolver for INSERT/DELETE/UPSERT/payload-UPDATE, and the walker for table-return UPDATE).

This item absorbs the intermediate: have UpdateRowsWalker classify GraphQLInputObjectField shapes from SDL directly (the @reference FK-join path resolution and @nodeId decode-method resolution), so the UPDATE path no longer depends on the upstream TableInputType.inputFields() classification and the duplicated per-field rules collapse back to one owner. Mirrors R256 (service-walker-substrate-absorption), which does the analogous absorption for the service walker.

The UpdateRowsWalker javadoc references this item by slug (updaterows-walker-sdl-substrate).