The weakness in the rest-rule finding was that `last` had been SCORED on
only two elements. It cannot be scored on more -- only two ambiguous
elements sit on a screen with a live capture -- but the entry -> hold ->
exit model makes a prediction that can be checked on all 2 305: what does
each element's FINAL keyframe look like?
final keyframe invisible (a = 0) 1 618 transient: gone at rest
final keyframe visible, at max alpha 675 faded in and stopped
final keyframe visible, BELOW max alpha 12 genuinely unclear
Of the 687 that end visible, 472 have monotonically non-decreasing alpha
-- a plain fade-in that stops, [0, 255] over two keyframes in the
commonest case (pjex_eff.rat, pghud_speed_cut.t32) -- and another 203 end
at their maximum after dipping.
So `last` is structurally defensible for 2 293 of 2 305 (99.5 %), against
a dwell rule that returns a mid-movement frame by construction. Observed
correct for 2, structural for 675, model-consistent for 1 618, unclear
for 12.
The assumption carrying the 1 618 is stated rather than buried: that a
plateau-less element's animation has finished by the time the screen is
settled. The draw log establishes exactly this for the two splash glows
(drawn frames 94-115, logos 116-211) and establishes nothing for the
rest.
Default still unchanged. The case is now observational, structural and
model-based rather than two data points, but it would move 1 896 elements
and the decision belongs with whoever owns the renderer.
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