port: the 11.5 px was the fit's resolution -- and the lesson inverts

The Decoder closed it by ADDING OBSERVABLES, not by tuning. The vertex buffer
carries positions and colours at the same instant, so all four quantities must
agree on one t: quad A x solves to 357.88 and quad B x to 357.58, both +/-0.12
units, against 355.75 +/-1.54 and 354.09 +/-1.89 from the alphas. Alpha moves
only 0.27-0.33 levels per unit, so one byte of quantisation is worth 1.5-1.9
units -- 6-8 px of sweep at 4 px/unit. That is the whole of the 11.5 px. At
t=357.7 the centres land within 0.70 px and both alphas inside one level.

THE LESSON IS THE EARLIER ONE INVERTED AND IT IS THE HALF WORTH KEEPING.
Checking a wrong rule against alpha made it look confirmed; here the same
insensitivity MANUFACTURED a residual that did not exist. An insensitive quantity
does not merely fail to falsify -- it invents error. Solve on the fastest-moving
field, check the slow one, never the reverse. I was already looking for a pivot
rule to explain 11.5 px when they wrote; there was nothing to find.

REFUTATION ATTEMPT, survived with a nuance: they state the leaf pivot is (200,90)
on a 399x180 sprite, "the pivot is the centre, so rotation displaces it by
nothing". Checked against my export -- pivot [200,90], sprite 399x180, true
centre 199.5,90. It survives, but the sprite is ODD-WIDTH so the pivot is the
centre to within half a pixel rather than exactly. No consequence against their
0.70 px agreement; worth stating because "displaces it by nothing" is the kind of
sentence that later gets leaned on for a sub-pixel claim.

verify-capture now poses the title at t=357.7 rather than 355: RMSE 21.07 ->
20.92, differing 1.82% -> 1.81%. Marginal, and it is the right pose for a stated
reason rather than a better number.

AND ptlogo_eff2 IS WITHHELD FOR A BETTER REASON THAN MINE. I had it on caution
about untested generalisation; the Decoder points out it is on title_jp and
MISSION section 7 scopes out "localisation beyond English", so it is not a
question this port has to answer and the parked Japanese capture does not need
reviving for it. authored/rendering.json now gives scope first and undecidability
second. Widening scope to close a residual would have been the wrong trade.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N7FiFFFwbvG2uxdcEh8HyF

authored/rendering.json

@@ -13,19 +13,29 @@
   "one consistent time, then PREDICTED the quad centres to ~11 px. That covers",
   "`ptloop01` and `ptloop02` and nothing else."
  ],
- "draw_leaf_for": ["ptloop01", "ptloop02"],
+ "draw_leaf_for": [
+  "ptloop01",
+  "ptloop02"
+ ],
  "draw_leaf_why": [
   "The two the decode covers. `docs/re/structures/ui-leaf-vs-parent-alpha.md`.",
   "",
   "NOT DRAWN, though the exporter flags them and ships their data:",
   "",
-  "  `title_jp/ptlogo_eff2` -- parent 125% at (412,96), leaf 100% at (402,66).",
-  "  It is the same SHAPE as the ptloop case and it is the element DECISIONS has",
-  "  recorded since P1 as the largest render disagreement in the export. The",
-  "  Decoder said in as many words: 'I have not tested it.' Drawing it would be",
-  "  extending a decode past the case it was fitted on, which is the failure",
-  "  this port has made four times this session.",
+  "  `title_jp/ptlogo_eff2` -- OUT OF SCOPE, which is a better reason than",
+  "  the caution this entry first gave. MISSION section 7 scopes out",
+  "  'localisation beyond English', and this element exists only on the",
+  "  Japanese title. So it is not a thing the menu port has to answer, and the",
+  "  parked Japanese-locale capture does not need reviving on its account --",
+  "  that is the human's call and not something either agent widens quietly.",
   "",
+  "  It is ALSO undecidable here even if it were in scope. Its 125% is a POP,",
+  "  not a steady scale: scale-0 -> 125% -> scale-0 between t=50 and t=107,",
+  "  about 0.95 s. The leaf draws at 100%, as two superimposed copies at alpha",
+  "  160 and 80, each rotating 360 degrees over 960 units -- 16 s a turn. If",
+  "  parent scale gates the leaf it is a 0.95 s flash; if the leaf runs free it",
+  "  spins for 16 s. Nothing on the disc chooses and title_jp has no oracle",
+  "  capture.",
   "  `build_12,15/pgloading_loop5` -- leaf scale (0,0). A zero scale is one of",
   "  the three historical failures this corpus names, so it is exactly where a",
   "  guess is most expensive.",