[derek73]

Follow-up to #735's altitude review.

C12 (a suffix word ending the name before the comma) decided which words in the part after the comma are titles with a hand copy of C8's test (the suffix-comma credential run) that asked only a one-word piece's vocab:title tag. A title joined by P3 (the connective join) carries the piece tag title instead, so it fell to the suffix side:

Input	Before	After
John Smith Jr., Mr. and Mrs. AD	suffix Jr., Mr. and Mrs. AD	title Mr. and Mrs., suffix Jr., AD
Dr. Smith Jr., Secretary of State AD	title Dr., suffix Jr., Secretary of State AD	title Dr. Secretary of State, suffix Jr., AD

Already reading title Mr. and Mrs. before this change: John Smith, PhD Mr. and Mrs. AD (C8) and John Smith Jr., Mr. and Mrs. (no credential). _behind_a_generation now asks C8's predicates in C8's order, not is_suffix_piece then is_title_piece. Those agree with the old copy on every one-word piece, so a title and suffix dual still reads as a suffix, as C12 states.

A dual inside a joined title now reads as part of the title (John Smith Jr., AD Sr. and Mr. → title Sr. and Mr.), as C8 reads it (John Smith, PhD Sr. and Mr.). A dual standing alone still reads as a suffix (John Smith Jr., Sr. AD → suffix Jr., Sr. AD).

Measured (2026-10-19) against the parent a454917, extracted with git archive and __file__ asserted on both sides. The grid: 8 names ending in a suffix word × 32 parts × the three orders = 768 parses. The full grid is listed in decisions/C12.

• 192 readings move: exactly the eight parts where a joined title stands beside an unlisted credential, under every name and order. Each moves from suffix to title. The eight parts are Mr. and Mrs. AD, AD Mr. and Mrs., Mr. & Mrs. AD, Dame and Sir AD, Secretary of State AD, AD Sr. and Mr., Mr. and MD AD and Dr. and Ms AD.
• Already titles, unchanged: a joined title beside a listed credential (Prof. and Dr. MD) or with no credential (Secretary of State) already read as a title, because C12 isn't reached.
• No ambiguity kind or initials() changes. No corpus name moves; the snapshot only gains C12's new examples.

Not touched: John Smith Jr., Lt. Gov. AD still reads title Gov., suffix Jr., Lt. AD. Lt is a dual, and C12 reads duals as suffixes.

Changes:

• nameparser/_pipeline/_comma.py: the swap, with pt1 passed into the helper
• rules/C12: the statement names joined titles (P3, C7), including a dual inside one, adds Mr. and Mrs. and Sr. and Mr. examples, and lists P3 and C7 under interacts; C7 lists C12 back
• decisions/C12: a dated entry with the measurement
• AGENTS.md: the spellings paragraph records a joined title as a third spelling path for a title, and says to ask both of C8's predicates in order
• corpus_rules.jsonl and snapshot.jsonl regenerated

Suite: 21,589 passed; mypy and ruff clean.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.05%. Comparing base (a454917) to head (d4e9ca5).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #738   +/-   ##
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  Coverage   99.05%   99.05%           
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  Files          46       46           
  Lines        4647     4647           
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  Hits         4603     4603           
  Misses         44       44           

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