Bench identified: SMPTE colour bars + 3D scene layer; bars = acceptance oracle

User-provided ground truth: the cap7 test scene displays SMPTE colour bars.
Axis-alignment census (8/196 axis-aligned) proves the recovered triangles are
the 3D test-scene layer, not the bars -- the bars are the OUTPUT of the
standard background program (the byte-identical bit-serial SENDE/SEND set in
every capture: a video test card painted as the permanent backdrop, colours
written to the eofr/g/b planes 184/192/200 by the x2-chain sweeps). Payload
formats settled: size-18 = 3 edges + z-plane; size-21 = 3 edges + texture-ramp
SCALAR plane (the pvision mechanism). The known bar pattern is now the
pixel-exact acceptance oracle for the bit-serial program executor (the
chartered IGC_* macro work). Readout §06 caption updated.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

emulator/firmware-decomp/render-readout.html

@@ -375,9 +375,12 @@
     <div class="hero-render" style="margin-top:16px">
       <span class="tag">exact recovery · edge equations solved to vertices</span>
       <canvas id="benchframe" width="832" height="512" aria-label="the hardware test pattern recovered exactly from compiled edge equations"></canvas>
-      <div class="cap"><b>the VelociRender test bench</b> — every triangle solved from its
-      compiled edge equations; colors distinguish primitives (true per-primitive colors live
-      in the payload's colour planes, still being decoded).</div>
+      <div class="cap"><b>the VelociRender test bench — the 3D scene layer</b>: every triangle
+      solved from its compiled edge equations (palette colors; the true shades are texture-ramp
+      scalars, decoded but not yet mapped). Beneath this layer the bench paints <b>SMPTE colour
+      bars</b> — the standard background program present byte-identical in every capture; its
+      bit-serial sweep is the next execution target, with the known bar pattern as the
+      pixel-exact acceptance oracle.</div>
     </div>
   </section>