maven: fix test mocks for CalendarEvents interface (verification)

- Add CalendarEvents method to recordingAPI in auth_test.go
- Add CalendarEvents method to fakeCore in handlers_test.go

Co-Authored-By: opencode <opencode@anthropic.com>

internal/worker/frame.go

@@ -64,4 +64,4 @@ func readFrame(r io.Reader, v any) error {
 		return fmt.Errorf("worker: unmarshal frame: %w", err)
 	}
 	return nil
-}
+}