Stop base64 encoding LLM responses in debug output

internal/framework/pipeline/runner_test.go

@@ -2,7 +2,6 @@ package pipeline
 
 import (
 	"context"
-	"encoding/base64"
 	"errors"
 	"reflect"
 	"strings"
@@ -1323,9 +1322,8 @@ func TestRunDebugFailedChunkAttemptReferencesScopedLLMOutput(t *testing.T) {
 	if !ok {
 		t.Fatalf("scoped payload type = %T, want debugStructuredLLMCall", scoped.Payload)
 	}
-	wantContent := base64.StdEncoding.EncodeToString([]byte(`{"raw":true}`))
-	if scopedPayload.Response.Content != wantContent {
-		t.Fatalf("scoped response content = %q, want %q", scopedPayload.Response.Content, wantContent)
+	if scopedPayload.Response.Content != `{"raw":true}` {
+		t.Fatalf("scoped response content = %q, want raw LLM response", scopedPayload.Response.Content)
 	}
 	_ = recorder.envelope(t, call.CanonicalPath)
 }