Pin the 殿 exclusion, the one nothing held (#308)

Every other glued-set exclusion has a case row holding it -- 氏 by
zh_glued_shi_stays, 博士 by ja_glued_degree_stays, 君 by
zh_glued_jun_stays, 양 by ko_suffix_matching_is_whole_token -- while
殿, which has the longest argument behind it, had none: adding it back
to GLUED_HONORIFICS passed the entire suite. The discriminating input
is the lone surname 鵜殿 (Udono), which a peeled 殿 would report as
family 鵜 plus suffix 殿; a two-token 真殿 太郎 puts the site scan on
太郎 and never consults the exclusion. Verified by adding 殿 back: the
new row and its facade twin are the only tests that then fail.
Classified fix(#271) like its neighbours -- 1.4.0 gives first 鵜殿 and
no last, so it is the CJK order flip that moves the field.

corpus_cjk.jsonl regenerated; differential stays 0 unexplained.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: derek73

tests/v2/cases.py

@@ -877,6 +877,21 @@ def __post_init__(self) -> None:
          classification="fix(#271)",
          notes="likewise: 王氏 is a historical name form ('the Wang "
                "woman'). The spaced 田中氏 keeps its entry"),
+    Case("ja_glued_dono_stays", "鵜殿",
+         {"family": "鵜殿"},
+         classification="fix(#271)",
+         notes="the exclusion with the longest argument behind it and, "
+               "until this row, the only one nothing held: adding 殿 "
+               "back to GLUED_HONORIFICS passed the whole suite. 鵜殿 "
+               "(Udono) is a real surname, one of roughly ninety "
+               "Japanese surnames ending in 殿 (真殿, 大殿, ...), and a "
+               "peeled 殿 would give family 鵜 with 殿 in suffix. It "
+               "has to be the BARE surname: in a two-token 真殿 太郎 "
+               "the site scan lands on 太郎 and the exclusion is never "
+               "consulted, so only a lone surname discriminates. "
+               "Classified to #271 like its neighbours, not parity: "
+               "1.4 gave first 鵜殿 and no last, and it is the CJK "
+               "order flip that makes the one token a family name"),
     Case("ja_dono_spaced", "田中 殿",
          {"family": "田中", "suffix": "殿"},
          classification="fix(#308)",

tools/differential/corpus_cjk.jsonl

@@ -48,6 +48,7 @@
 "高橋みなみ"
 "高橋・一郎"
 "高橋一郎"
+"鵜殿"
 "김 민준"
 "김민준"
 "김민준 님"