Records that the garble window is unbounded (the 1s watchdog never arms for an
occluded pane), that the diff-based-staleness hypothesis was refuted by
measurement and reverted, why pixel oracles are structurally blind here, and the
two leads now closed by measurement (dimension staleness, lazy atlas bindings).
Refs STA-2694.
Co-authored-by: Orca <help@stably.ai>