feat(extras): promote 老抽 / プーアール茶 from candidate scan

engine/crates/lex-cli/src/dict_source/extras/food.tsv

@@ -7,6 +7,10 @@
 # --- 中華料理 (調味料・スパイス) ---
 たんじゃお	藤椒
 ほわじゃお	花椒
+ろうちゅう	老抽
 
 # --- 日本茶ブランド ---
 いっぽどう	一保堂
+
+# --- 中国茶 ---
+ぷーあーるちゃ	プーアール茶

engine/testcorpus/accuracy-corpus.toml

@@ -455,6 +455,20 @@ expected = "一保堂"
 category = "extras"
 tags = ["food", "brand"]
 
+[[cases]]
+reading = "ろうちゅう"
+expected = "老抽"
+category = "extras"
+tags = ["food", "chinese-cuisine"]
+note = "Mozc 既存の top-1 は 郎中。老抽 (中華の濃口醤油) は extras 層で補完"
+
+[[cases]]
+reading = "ぷーあーるちゃ"
+expected = "プーアール茶"
+category = "extras"
+tags = ["food", "tea"]
+note = "Mozc 単語は無く、lattice では プーアール+ちゃ の mixed-script が top-1。compound 単語化で正しく茶に固定"
+
 [[cases]]
 reading = "きららざか"
 expected = "雲母坂"