re: the sweep IS drawn on the JP title -- and my gate was phase-locking the shutter

The occlusion hypothesis is refuted: build 7 draws the same three ROT strips at
higher alpha than English, so there was never an absence to explain.

The 0.32-vs-11.9 tension that motivated it was an artefact of my own instrument.
Both JP captures were shuttered on the plate pulse, and the plate's pulse is part
of the animation -- so the gate synchronises the shutter to the animation's phase.
Measured at the shutter instant, the sweep sits 25-26 px apart across two runs in
different locales and different sessions: 1.6 % of a ~1600 px traverse.

So the 0.32 I recorded as between-session capture noise measures my trigger's
repeatability, and I read it as evidence the title is still when it is evidence
the gate works. The era adjudication is unaffected -- margin 16.72 clears even the
un-locked 11.9 -- and unaffected for the reason that file already gave: correlated
noise cancels in a margin.

Refutation attempt on sylpheed-port's positional-mechanism rejection: FAILED, the
claim stands. Its residual sits inside lit logos, and the logo ROI is
byte-identical across five differently-phased frames in two sessions.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v

docs/re/data/jp-title-at-rest.txt

@@ -74,3 +74,29 @@
 # scores moved 0.001-0.002 between sessions and the margin moved 0.001, against
 # an in-box capture noise of 0.32. A margin between two renders scored on one
 # capture is far more robust than either score is.
+
+################################################################################
+# 🔴 CORRECTION -- 2026-08-30, same day. The BETWEEN-SESSIONS block above rests
+# on a premise I have now measured and it is FALSE.
+#
+# It reasons that a second session probes a new axis, "where a free-running
+# clock lands somewhere else on a fresh boot". It does not. Both captures were
+# shuttered on the plate pulse, and the plate's pulse is PART of the title
+# animation, so the gate synchronises the shutter to the animation's phase.
+#
+# Measured (structures/plate-pulse-phase-lock.md): at the shutter instant, the
+# sweep strips sit 25-26 px apart between two runs in DIFFERENT locales and
+# different sessions -- 1.6 % of a ~1600 px traverse.
+#
+# CONSEQUENCES:
+#   * "in-box capture noise of 0.32" is a PHASE-LOCKED LOWER BOUND, not capture
+#     noise. At an arbitrary phase the figure is 11.9 (two EN captures a
+#     plateau-phase apart). Do not reuse 0.32 as a noise floor.
+#   * I read 0.32 as showing the JP title is still. It shows the GATE works.
+#
+# WHAT SURVIVES UNCHANGED:
+#   * The margin 16.72 exceeds even the un-locked 11.9, so the era adjudication
+#     holds either way -- and holds FOR THE REASON THIS FILE GIVES: noise moves
+#     both candidates together and nearly cancels in a margin.
+#   * The five-frames-per-run at-rest result, which is not gated per frame and
+#     therefore does sample different phases.

docs/re/data/title-sweep-drawn-at-rest.txt

@@ -196,3 +196,16 @@
 # slightly non-uniform one (-4.0667 then -4.0625), and it PASSES. So the curvature
 # is in the strip whose source data is exactly straight: it is not in the disc, and
 # it is either in the measurement or in how the game advances the record.
+
+################################################################################
+# ✅ SETTLED 2026-08-30 -- and the hypothesis in this file is REFUTED.
+# See data/title-sweep-jp-draw-capture.txt and structures/plate-pulse-phase-lock.md.
+#
+# The leaves ARE drawn on the JP title -- same three ROT strips, same
+# dimensions, at HIGHER alpha than English. There is no occlusion and no
+# absence.
+#
+# The 0.32-vs-11.9 tension that motivated the hypothesis was not a fact about
+# the game at all: both JP captures were shuttered on the plate pulse, which
+# phase-locks the shutter to the animation (25-26 px apart on a ~1600 px
+# traverse). 11.9 is the honest number; 0.32 is the gate.

docs/re/data/title-sweep-jp-draw-capture.txt

@@ -0,0 +1,45 @@
+# Are the sweep leaves DRAWN on the Japanese title? -- 2026-08-30
+#
+# THE TENSION THIS WAS RUN TO SETTLE (from title-sweep-drawn-at-rest.txt):
+#   two EN title captures a plateau-phase apart differ by RMSE 11.9 inside the
+#   adjudication box, while two JP title captures from different SESSIONS differ
+#   by 0.32 there. I hypothesised the game might not draw the leaves at rest on
+#   the JP title -- build 7's denser logo stack (katakana + crystalline burst)
+#   occluding them.
+#
+# INSTRUMENT: tools/re-capture/jp_draw_capture.sh -- sets console language ja
+# (trap-restores en on ANY exit), ensure_single_emulator, boots with
+# --log_ui_draws --ui_draw_capture_frames=150, arms F10 on the plate pulse.
+# Locale restore VERIFIED: language back at 1 after the run.
+#
+# CONTROL: the same extraction run against the ENGLISH title draw log
+# (/sylph-home/re/titledraw2), where the leaves are known to be drawn.
+#
+# TALL ROT STRIPS (h > w, h > 720) -- alpha is the vertex colour's high byte:
+#
+#   EN title:  1299x1303  n=112  alpha 139..181  mean 160.0  rot=ROT
+#               883x1134  n= 77  alpha 142..193  mean 168.1  rot=ROT
+#               890x1134  n= 55  alpha 142..193  mean 165.9  rot=ROT
+#
+#   JP title:  1299x1303  n= 82  alpha 141..212  mean 179.9  rot=ROT
+#               883x1134  n= 76  alpha 144..231  mean 187.9  rot=ROT
+#               890x1134  n= 33  alpha 149..229  mean 193.5  rot=ROT
+#
+# ✅ THE LEAVES ARE DRAWN ON THE JP TITLE. Same three strips, same dimensions,
+# and at HIGHER alpha than English (mean 180/188/194 vs 160/168/166). The
+# occlusion hypothesis is dead: there is no absence to explain.
+#
+# ⚠️ WHAT THIS LOG CANNOT SAY. These are ROT quads: the logged w x h is the
+# AXIS-ALIGNED BOUNDING BOX of a rotated strip, and the ink is a narrow diagonal
+# band inside it. The x spans (-634..992) cross the adjudication box's x range
+# (389..776), but a bounding box crossing a box does NOT mean ink does. I made
+# that inference first and it does not hold.
+#
+# ❌ AND THE SLOPES ARE NOT RATES. Least-squares over the captured frames gives
+#   1299x1303  slope -7.193 px/frame  rms 30.98  sign-changes  2/81
+#    883x1134  slope +7.141 px/frame  rms 29.49  sign-changes  4/75
+#    890x1134  slope +6.962 px/frame  rms 29.03  sign-changes  2/32
+# Every fit FAILS the linearity gate (residual sign-changes far below ~30 %,
+# rms ~30 px against a ~1600 px traverse): the motion is curved over the capture
+# window, so +-7.1 is the chord of an arc, not a velocity. Do not quote it.
+# This is the SAME failure the "6-7 px/frame" eyeball made -- see METHOD.md.