docs: the splash .prm measured -- and its paint order is a sequence, not depth

ui-prm-primitives recorded that where a .prm paints on a screen without a
measured order is unsolved. For the developer splash it is now measured.

Every frame opens with two full-screen draws before any sprite. The
second is untextured in all 212 frames with a constant vertex colour of
FF000000 -- opaque black -- matching palogo_eff0.prm's declaration
exactly: kind 0x10, pivot (640,360) -> 1280x720, one keyframe, a = 255.
So the splash backdrop is an opaque black full-screen quad from the
bundle itself, painted behind every sprite, which is why a splash render
needs --black rather than the default backdrop.

Not a general rule, and said so: the measured main-menu order puts
pteff02.prm at position 4 and pteff00.prm LAST, the latter being the
screen-transition fade.

And a correction to an existing row. measured_paint_order returns
[0, 2, 4, 6, 1, 3, 5] for the splash, described as "the .prm, then all
three glows, then the three logos". But the glows and the logos never
appear in the same frame -- 0 overlapping frames in 235 -- and two
elements that never co-occur have no observable relative depth. Between
those halves the vector records the order they were SEEN IN, not a
front-to-back relationship.

That does not make the render wrong, and element 0 is a real depth
observation since the .prm co-occurs with everything. But the type of the
claim matters: reading the vector as depth invites compositing all seven
elements at once, which is exactly what does not reproduce the screen.

METHOD: two things that never co-occur have no observable relative order;
when recording an order, note which pairs actually appeared together.

docs/re/REFUTED.md

@@ -595,3 +595,9 @@ neighbourhood, not just the line.
   glows — so whichever was active, a subset of its elements was drawn at a time.
   Selective activation is reinstated on evidence.
   [`ui-group-start-time.md`](structures/ui-group-start-time.md)
+* "the splash's `measured_paint_order` records a front-to-back depth order" →
+  **mis-typed.** Its glows and logos never share a frame (0 overlap in 235), so
+  their relative depth was never observable — between those halves the vector
+  records the *temporal* order they were seen in. Element 0 (`palogo_eff0.prm`)
+  is a genuine depth observation, because it co-occurs with everything.
+  [`ui-prm-primitives.md`](structures/ui-prm-primitives.md)