Web capture runs frames in parallel browser contexts (default from the CPU count, lower for GPU-heavy capture),
logs n/total + ETA and goto / waitFor / eval / delay / screenshot per frame, writes .storebound/capture-report.json
with the slowest frames and steps. shots.capture.session 'per-language' boots the app once per language and device
and switches shots via pushState / popstate (navigate 'spa') or goto (navigate 'reload'), falling back to a fresh
page when a precondition fails. .storebound/capture-cache.json skips frames with unchanged inputs; --only-missing,
--force. shots render renders with --concurrency pages and async ffmpeg.
