handoff: GP_DIALOG 2/3 are an EN/JP pair, measured on both locales

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

docs/port/HANDOFF.md

@@ -23,6 +23,36 @@ delivered.
 
 
 
+
+## ✅ 2026-08-31 — `GP_DIALOG` 2/3 **are** an English/Japanese pair, measured
+
+Closes the item I left open when I withdrew "an EN/JP pair" as a bare assertion.
+The `ja` capture of `DIFFICULTY` is taken.
+
+**EN vs JP differ in 1.82 % of pixels, in four bands and nowhere else:**
+
+| band | what |
+|---|---|
+| y 133–182 | the heading — `DIFFICULTY` → **難易度選択** |
+| y 376–410 | the ring, 2 px |
+| y 516–551 | the `BACK` label → **戻る** |
+| y 640–677 | the footer → 選択 / 決定 / 戻る |
+
+📌 **`EASY` / `NORMAL` / `HARD` are not in the differing set** — the Japanese
+release leaves the three difficulty names in Latin script. That is why the disc
+figure is small: **2.77 % of bytes**, against 1.82 % of pixels.
+
+✅ The JP screen also **opens on `NORMAL`**, like English, and the sweep reproduced
+the reset finding in Japanese (1.3 vs 93.9, against English's 1.0 vs 93.9).
+
+⚠️ **Reach: one JP boot, one screen — it does not generalise.** `GP_TITLE` 4/7, the
+title art, is already known to differ by *more* than text: entry 7 carries nine
+sprites entry 4 lacks.
+
+[data](../re/data/difficulty-is-a-language-pair.txt) ·
+[capture](../re/captures/menu-nav/live-jp-difficulty.png)
+
+
 ## 🟡 2026-08-31 — first JP main-menu capture: initial focus is 新規, layout identical
 
 Went for a `ja` capture of `DIFFICULTY` to settle whether `GP_DIALOG` 2/3 are