re: B on the main menu goes to the TITLE -- measured, filling an empty evidence cell

menu-navigation-semantics.md had this row at yellow with an EMPTY evidence cell,
and it is what the port still authors as on_cancel.

Delivery-confirmed via [RE-INPUT] (B is kXInputPadB = 0x5801), change detected
rather than timed. B delivered at 331.2 s; the glyph leaves 327 by 331.6 and
73.5 % of pixels differ. Both captures name themselves: PROJECT SYLPHEED with the
(C)2006,2007 SQUARE ENIX line.

Three things measured:
  * B on the main menu goes to the title;
  * latency <= 0.4 s at a 4 Hz sample rate, where the corpus previously had this
    as 'not measured (a backlogged probe void)';
  * NO loading screen in between -- the disc carries four pgloading_* bundles and
    none appears on this path.

What the run CANNOT say, recorded in the table rather than glossed: 'B on the
title -> nothing' is still unevidenced. The second B was delivered during the
title's build-in, so the glyph 0 -> 154 change after it is the build-in
completing, not a response. A run that answers that row must wait for the title
to settle before pressing.

The 're-draws PRESS A after a beat' half of the first row is also still
unevidenced -- the run ended with the plate absent.

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

docs/re/data/b-on-main-menu.txt

@@ -0,0 +1,63 @@
+# What Ⓑ does on the MAIN MENU -- measured 2026-08-30.
+#
+# menu-navigation-semantics.md had this row at 🟡 with an EMPTY evidence cell,
+# and it is what the port still authors as on_cancel.
+#
+# Harness: tools/re-capture/b_from_menu.py -- the plate-pulse title detector,
+# the glyph-327 menu detector, delivery confirmed from [RE-INPUT] rather than
+# from the pad, and change detected rather than timed. B is kXInputPadB =
+# 0x5801 (ui/virtual_key.h:323).
+#
+#   [321.7s] TITLE (glyph 959)
+#   [322.7s] A delivered (attempt 1)
+#   [327.7s] MENU (glyph 327) -- pressing B
+#   [331.2s] B delivered (attempt 1)
+#   [335.0s] screen changed: 73.5 % of pixels differ, glyph 0
+#   [341.3s] glyph 154
+#
+# THE SERIES ACROSS THE PRESS (t : glyph):
+#   326.2 : 0
+#   326.5 : 327
+#   326.7 : 327
+#   326.9 : 327
+#   327.2 : 327
+#   327.4 : 327
+#   327.7 : 327
+#   331.2 : 327
+#   331.6 : 0
+#   332.4 : 0
+#   332.8 : 0
+#   333.3 : 0
+#   333.8 : 0
+#   334.1 : 0
+#   334.5 : 0
+#   335.0 : 0
+#   340.2 : 0
+#   340.5 : 54
+#   340.7 : 154
+#   340.8 : 154
+#   340.9 : 154
+#   341.0 : 154
+#   341.1 : 154
+#   341.2 : 154
+#   341.3 : 154
+#
+# READING: B on the main menu goes to the TITLE. Both captures name
+# themselves -- PROJECT SYLPHEED with the (C)2006,2007 SQUARE ENIX line.
+#   2-after-B-on-menu.png  the title MID-BUILD-IN: wordmark drawn, the green
+#                          copyright line not yet -- which is why glyph is 0
+#                          while 78.0 % of the surface is inked
+#   3-after-B-again.png    copyright drawn, glyph 154 = the plate-absent floor
+#
+# ✅ NO LOADING SCREEN between. The disc carries four pgloading_* bundles and
+# none appears on this path.
+#
+# ✅ LATENCY <= 0.4 s: B delivered at 331.2, glyph leaves 327 by 331.6, at a
+# 4 Hz sample rate. The corpus previously had this as 'not measured (a
+# backlogged probe void)'.
+#
+# 🔴 WHAT THIS RUN CANNOT SAY: 'B on the title -> nothing'. The second B was
+# delivered at 340.2, DURING the title's build-in, so the glyph 0 -> 154
+# change that follows is the build-in completing and not a response. That row
+# stays 🟡 with no evidence, and a run that answers it must wait for the title
+# to SETTLE before pressing.