- Network idle: click on fetch button waits for XHR, static click is fast
- Chain pipe: pipe-delimited commands, quoted args, JSON still works
- State: save/load round-trip, name sanitization, missing state error
- Frame: switch to iframe + back, snapshot context header, fill in frame,
goto-in-frame guard, usage error
New fixtures: network-idle.html (fetch + static buttons), iframe.html (srcdoc)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
