Remove direct output validation

internal/validate/validator.go

@@ -6,14 +6,6 @@ import (
 	"go.maximumdirect.net/promptkit/internal/domain"
 )
 
-// Validator validates the generated artifact based on the output contract.
-// Validation checks ctx around Promptkit-controlled work and synchronous
-// dependency calls. A dependency call already in progress cannot be preempted;
-// after it returns, cancellation takes precedence over its result.
-type Validator interface {
-	Validate(ctx context.Context, artifact *domain.Artifact, contract domain.OutputContract) (domain.ValidationResult, error)
-}
-
 // PreparedValidation validates artifacts against one frozen output contract.
 // Its cancellation boundary is synchronous: Validate does not detach schema
 // execution, and an observed context error prevents publication of a result.