Remove prompt version selectors

internal/usecase/runner.go

@@ -315,7 +315,7 @@ func (r *Runner) resolvePreparation(
 		return nil, fmt.Errorf("%w: session_id: %v", ErrInvalidRequest, err)
 	}
 
-	promptSelection, err := r.resolvePromptDefinition(ctx, req.PromptID, req.PromptVersion)
+	promptSelection, err := r.resolvePromptDefinition(ctx, req.PromptID)
 	if err != nil {
 		return nil, err
 	}
@@ -517,22 +517,15 @@ func structuredOutputSpec(def *domain.PromptDefinition, schemaDocument any) *dom
 	return &domain.StructuredOutputSpec{
 		Type: domain.StructuredOutputJSONSchema,
 		JSONSchema: &domain.StructuredOutputJSONSpec{
-			Name:   deriveStructuredSchemaName(def.ID, def.Version),
+			Name:   deriveStructuredSchemaName(def.ID),
 			Strict: true,
 			Schema: schemaDocument,
 		},
 	}
 }
 
-func deriveStructuredSchemaName(promptID string, promptVersion string) string {
+func deriveStructuredSchemaName(promptID string) string {
 	raw := strings.TrimSpace(promptID)
-	if v := strings.TrimSpace(promptVersion); v != "" {
-		if raw == "" {
-			raw = v
-		} else {
-			raw = raw + "_" + v
-		}
-	}
 
 	var b strings.Builder
 	for _, r := range raw {