Remove redundant captured prompt fields

internal/usecase/runner.go

@@ -641,9 +641,6 @@ func copyExtraParams(src map[string]any) map[string]any {
 
 func resolveOutputContract(def *domain.PromptDefinition, override *domain.OutputContract) (domain.OutputContract, error) {
 	contract := def.Validation
-	if contract.Format == "" {
-		contract.Format = def.OutputFormat
-	}
 	if override != nil {
 		contract = *override
 		if contract.Format == "" {

internal/usecase/runner_test.go

@@ -2504,7 +2504,6 @@ func promptDef(format domain.OutputFormat, mode domain.ValidationMode, attempts
 		DefaultProfile: "exec",
 		Inputs:         []domain.PromptInput{{Name: "transcript", Required: true}},
 		Templates:      []domain.PromptMessageTemplate{{Role: "user", Content: "x"}},
-		OutputFormat:   format,
 		Validation: domain.OutputContract{
 			ValidationMode: mode,
 			RepairAttempts: attempts,