Coordinate-level verdicts masked by reflection and binding rejections outside the @service seat

@externalField. The @reference-path deferral ("condition-join lift form is not yet supported") lives in GraphitronSchemaValidator.validateComputedField and only runs on a successfully classified ComputedField, so every reflectExternalField signature rejection (arity, non-Table parameter, non-Field return, parent-record mismatch) masks it. An author whose field carries @reference gets told to fix a signature that cannot help.

@sourceRow. SourceRowDirectiveResolver.resolve runs its reflection step (lifter arity, parameter assignability, RowN return) before its derivation step, and the derivation carries coordinate-level rejections: leaf target table with no primary key, @reference first hop resolving to a condition join. A lifter with a wrong return type on a PK-less target is answered about the return type.

@condition + @lookupKey. FieldBuilder.projectForFilter returns on the ConditionResolver reflection rejection ahead of the "@lookupKey is declared but no argument resolved to a lookup column" verdict, so a misnamed condition parameter masks the lookup verdict.

Root @service residue. R649 hoists the coordinate verdicts inside ServiceDirectiveResolver.resolve but leaves the root polymorphic narrowing (the union-return rejection, the single-table-interface deferral) and the mutation payload checks (orphan service carrier, $source sigil rules) at the FieldBuilder query/mutation arms, downstream of binding, where a binding rejection still wins.