port: the capture has NEW GAME focused, and my harness had been rendering no focus

The Decoder attached an honest caveat to its reproduction of the tone-curve
refutation -- its bins included the focus-state mismatch, so it was "not a clean
second opinion". Removing that caveat found a defect of mine.

IDENTIFYING THE FOCUSED BUTTON, with a known-answer control. Walking focus
through all five buttons and comparing each against a capture:

                    vs -options-focused    vs live-main-menu
  ptbtn01 NEW GAME        6351                   531
  ptbtn02 LOAD GAME       7087                  7094
  ptbtn03 TUTORIAL        6230                  6237
  ptbtn04 OPTIONS         1292                  6364
  ptbtn05 EXTRAS          6073                  6080

The control picks OPTIONS by 4.7x -- the answer its own filename gives -- so the
test is trustworthy, and live-main-menu.png has NEW GAME focused by 11.5x. That
is what the port already focuses. Corroboration, NOT a decode: Q5's instability
stands (four boots gave TUTORIAL, TUTORIAL, NEW GAME, NEW GAME) and this
identifies one frame rather than a rule. Recorded in the authored entry.

THE DEFECT: `verify-capture` rendered menus with `--screen=`, which draws no
focus record, so it had been comparing main_menu to the oracle in a state the
oracle was never in.

  main_menu  0.25% differing, RMSE 14.79  ->  0.06%, RMSE 13.21
  extras     0.46%, RMSE 15.29            ->  0.20%, RMSE 13.38

A 4x improvement that was entirely my harness posing the port wrong rather than
the port drawing wrong. The first run of a new correctness harness reported a
discrepancy and three quarters of it was the harness.

AND THE DECODER'S CAVEAT RESOLVES TO NOTHING, measured rather than assumed:
re-deriving the transfer curve on the correctly-posed pair gives 1.20 / 1.26 /
1.18 / 1.10 / 1.03 / 0.94 at render 8..48, unchanged from the mismatched run. Its
reproduction stands as a second opinion after all.

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

tools/port/verify-capture

@@ -40,12 +40,21 @@ OUT="${OUT:-$(mktemp -d)}"; mkdir -p "$OUT"
 CAPS=docs/re/captures/title-builds
 
 # screen : capture : how to pose it
+# 🔴 A MENU CAPTURE HAS A BUTTON FOCUSED, AND THE FIRST VERSION OF THIS TOOL
+# RENDERED WITH NONE. `--screen=` draws no focus record at all, so `main_menu`
+# was being compared to the oracle in a state the oracle was never in: 2 159
+# differing pixels, of which 74 % sat inside the focus signature. Rendered with
+# focus it is 531 -- 0.06 % of the frame, a 4x improvement that was entirely my
+# harness posing the port wrong.
+#
+# `--menu=` applies `authored/flow.json`'s initial focus and `--script=wait`
+# shoots one settled frame and exits.
 MAP=(
-  "main_menu:$CAPS/live-main-menu.png:--time=99"
-  "extras:$CAPS/live-extras.png:--time=99"
-  "title:$CAPS/live-title-build4-no-plate.png:--time=99"
-  "publisher_logo:$CAPS/live-splash-publisher.png:--time=99"
-  "developer_logos:$CAPS/live-splash-developer.png:--time=99"
+  "main_menu:$CAPS/live-main-menu.png:menu"
+  "extras:$CAPS/live-extras.png:menu"
+  "title:$CAPS/live-title-build4-no-plate.png:screen"
+  "publisher_logo:$CAPS/live-splash-publisher.png:screen"
+  "developer_logos:$CAPS/live-splash-developer.png:screen"
 )
 CURVE=""
 if [ "${1:-}" = "--curve" ]; then CURVE=1; shift; fi
@@ -59,8 +68,14 @@ for row in "${MAP[@]}"; do
   IFS=: read -r name cap pose <<<"$row"
   if [ ${#want[@]} -gt 0 ] && ! printf '%s\n' "${want[@]}" | grep -qx "$name"; then continue; fi
   [ -f "$cap" ] || { printf '%-17s %s\n' "$name" "no capture"; continue; }
-  godot --path port --resolution 1280x720 -- "--screen=$name" "$pose" \
-    "--capture=$OUT/$name.render.png" >"$OUT/$name.log" 2>&1 || true
+  if [ "$pose" = menu ]; then
+    godot --path port --resolution 1280x720 -- "--menu=$name" --script=wait \
+      "--shots=$OUT/$name" >"$OUT/$name.log" 2>&1 || true
+    [ -f "$OUT/${name}_00_start.png" ] && cp "$OUT/${name}_00_start.png" "$OUT/$name.render.png"
+  else
+    godot --path port --resolution 1280x720 -- "--screen=$name" --time=99 \
+      "--capture=$OUT/$name.render.png" >"$OUT/$name.log" 2>&1 || true
+  fi
   [ -f "$OUT/$name.render.png" ] || { printf '%-17s %s\n' "$name" "render failed"; continue; }
   # Crop the render to the capture's frame. The capture is the crop, not a scale.
   convert "$OUT/$name.render.png" -crop 1279x675+0+0 +repage "$OUT/$name.crop.png"
@@ -68,7 +83,7 @@ for row in "${MAP[@]}"; do
   raw=$(python3 -c "print('%.2f' % (float('$raw')*255))" 2>/dev/null || echo "?")
   note=""
   case "$name" in
-    main_menu|extras) note="focus state may differ from the capture" ;;
+    main_menu|extras) note="rendered with authored initial focus" ;;
     title) note="ptloop sweeps never stop -- one moment vs another" ;;
   esac
   # Where the difference lives. This comes FIRST because it is what the gamma