// Session-title normalization shared by the agent runtime package (session// summaries read from disk) and the frontend's client-side message helpers. export function isPlaceholderSessionTitle(value: string | null | undefined): boolean {  const normalized = value?.replace(/\s+/g, " ").trim();  return Boolean(normalized && /^(?:\.{3}|…)+$/.test(normalized));} export function cleanSessionTitle(value: string | null | undefined): string {  const normalized = value?.replace(/\s+/g, " ").trim() ?? "";  return normalized && !isPlaceholderSessionTitle(normalized) ? normalized : "";} export function sessionTitleFromUserPrompt(value: string | null | undefined): string {  if (!value) return "";  const marker = "\n\nUser prompt:\n";  const markerIndex = value.lastIndexOf(marker);  const body = markerIndex === -1 ? value : value.slice(markerIndex + marker.length);  const visible = body.replace(    /^\s*<browser_context>(?:[\s\S]*?<\/browser_context>\s*|[\s\S]*$)/i,    "",  );  return cleanSessionTitle(visible);}