The Decoder's bound refutes screen_view.gd's 'parent alpha NOT multiplied in'.
Premise verified here: pteff03's leaf floors at 128, so a drawn alpha below that
cannot come from the leaf alone.
But the identification is 'by size', and pteff03 and pteff03a are BOTH 399x180 --
consistent with the two reported rows measuring 1.38x3.15 and 1.39x3.15. Size
separates the sweeps from the screen, not from each other.
That flips the cited row: pteff03a's leaf floors at 0 and ramps 0->128 over
t=0..150, so 8/24/33/50 is exactly that leaf alone. The conclusion may still hold
via the OTHER row (16 with a 128-131 cluster is pteff03's signature) -- the
finding may be right and the cited row wrong.
Free discriminator already in their capture: the leaves travel in OPPOSITE
directions, ~1000 px apart. Renderer unchanged until the row is identified.
c3a09edfb7