Add Promptkit execution adapter

internal/promptexec/promptexec.go

@@ -148,6 +148,16 @@ type Validation struct {
 	Diagnostics []string
 }
 
+// NewValidation returns a completed validation value with bounded diagnostics.
+func NewValidation(status ValidationStatus, mode string, schemaPath string, diagnostics []string) Validation {
+	return Validation{
+		Status:      status,
+		Mode:        mode,
+		SchemaPath:  schemaPath,
+		Diagnostics: boundDiagnostics(diagnostics),
+	}
+}
+
 // ValidationStatus identifies the completed validation state.
 type ValidationStatus string
 

internal/promptexec/promptexec_test.go

@@ -172,6 +172,10 @@ func TestBoundDiagnosticAndErrorText(t *testing.T) {
 	if bounded[0] != "a<>b" {
 		t.Fatalf("invalid UTF-8 diagnostic = %q, want replacement", bounded[0])
 	}
+	validation := NewValidation(ValidationFailed, "json_schema", "daily.schema.json", values)
+	if len(validation.Diagnostics) != maxValidationDiagnostics || validation.Diagnostics[0] != "a<>b" {
+		t.Fatalf("validation = %#v, want bounded diagnostics", validation)
+	}
 
 	err := NewError(Generation, strings.Repeat("é", maxErrorMessageBytes), nil)
 	if len(err.Error()) > maxErrorMessageBytes || !utf8.ValidString(err.Error()) {