Added support for OpenAI-compatible structured output

internal/usecase/repairer.go

@@ -18,6 +18,7 @@ type RepairRequest struct {
 	PreviousOutput   string
 	ValidationErrors []string
 	Target           domain.ExecutionTarget
+	StructuredOutput *domain.StructuredOutputSpec
 	Attempt          int
 	MaxAttempts      int
 	Mode             domain.ValidationMode
@@ -59,7 +60,11 @@ func (r *defaultOutputRepairer) Repair(ctx context.Context, req RepairRequest) (
 		},
 	}}
 
-	resp, err := r.llm.Generate(ctx, domain.GenerateRequest{Prompt: prompt, Target: req.Target})
+	resp, err := r.llm.Generate(ctx, domain.GenerateRequest{
+		Prompt:           prompt,
+		Target:           req.Target,
+		StructuredOutput: req.StructuredOutput,
+	})
 	if err != nil {
 		return nil, err
 	}