5e5b62b09e
Two readiness fixes surfaced by the first successful headless bake of a heavy scene (which exported with 33 items missing): - The 180-FRAME give-up cap silently assumed display-rate frames. The bake page's timer-driven loop (?disable=draw) runs those frames in ~3.6s — shorter than a cold item-model download — so the cap fired and the export raced ahead of real content. New `sceneReadyMaxWaitMs` Viewer prop replaces the frame cap with a wall-clock one on hosts whose frame cadence is decoupled from time; default frame behavior unchanged for interactive surfaces. - hasPendingSceneBuildWork now skips UNREACHABLE dirty nodes: orphans whose parent doesn't list them in `children` (or parentless non-roots) never render — every renderer enumerates the parent's children array — so no system ever builds them or clears their mark. Observed in prod scene data (two dangling windows parented to a level that doesn't list them): they held every bake of that scene to the full readiness cap. Validated: the 200+-item office scene with ?disable=draw settles organically in ~2s and exports the complete artifact; a one-shot 504'd item is now WAITED for through its retry instead of racing the cap. Co-authored-by: Claude Fable 5 <noreply@anthropic.com>