OptionalsignalOptionalframePer-tick LOD time budget during dimension-animation playback (see
ViewState.frameBudgetMs). Injected into the DERIVED per-node view
state below — a per-pass directive, so refinement/retry passes (which
derive independently) stay budget-free.
OptionalladderPinned playback ladder depth (see ViewState.ladderDepth). Same per-pass
contract as frameBudgetMs: injected into the DERIVED view state only.
Per-update abort signal forwarded to
loader.updateView(see DataLoader).