// Read-only recording gate: never close or navigate unrelated tabs.
export async function assertSingleRecordingTab(cdp,{singleWindow=false}={}){
 const current=await cdp.send('Browser.getWindowForTarget');
 const {targetInfos}=await cdp.send('Target.getTargets');
 if(!Array.isArray(targetInfos))throw Error('Cannot inspect recording-window tabs');
 let count=0;const windows=new Set();
 for(const t of targetInfos){
  if(t.type!=='page')continue;
  const {windowId}=await cdp.send('Browser.getWindowForTarget',{targetId:t.targetId});
  windows.add(windowId);
  if(windowId===current.windowId)count++;
 }
 if(count!==1)throw Error(`Recording window has ${count} tabs; move the project tab into its own window before recording. Preserve all other tabs.`);
 if(singleWindow&&windows.size!==1)throw Error(`Stage sees ${windows.size} Chrome windows; close completed mission verification/preview windows before recording. Preserve unrelated work and pause capture if it cannot be isolated.`);
 return {windowId:current.windowId,tabCount:count,windowCount:windows.size};
}