Make no particle chain in a part that holds no name word (#636) - #639

Summary

A part past the second comma, after either comma, is read entirely as suffixes, with its title words read as titles (C2, #603). Group still ran the particle chain over it, which builds a name unit no reading uses. A particle past the part's first word took the words behind it, including any title word among them.

The part after a suffix comma, which C2 also covers, has reached no chain since #613: _comma.decide binds it and empties its segment before any join. A suffix-comma grid of 606,216 parses moves nothing here (recipe in the decisions entry).

Group now makes no chain in such a part and asks for no chain bound there. C2 then reads every title word in the part, whether bare (Prof) or mid-part.

Decided (Derek): this approach, rather than the issue's proposal of #623's trailing_run_start bound at this site. That bound reads trailing titles only (H5), which is narrower than C2's rule, and it adds a call where removing the chain takes one away. The chain's two report emitters were already handed no report list in these parts, for the same reason. With no chain there, there is nothing to suppress.

Measured (against 3b2b6f0, py3.11, import asserted on each side; grid recipe in decisions.md#P2's 2026-10-10 #624 entry)

• Where does Freiherr St John Smith MA start: should a title that is also a particle open the name? #624's comma-tail grid (97,650 texts, three orders) plus every corpus name and case text: 18,318 parses on 6,106 texts move a role. All of them are in the grid; none of master's corpus names or case texts move, and no parse moves only a report.
  • 15,330: a title word that stood behind a particle run now goes into the title field. For example, ,, 'Bob' van der Attorney becomes title 'Attorney', suffix 'van der'.
  • 2,988: a particle comes back out of a title the chain had joined it to. The chain merged the particle with a title P3 had joined and kept the title tag. For example, master read ,, 'Bob' van der Mr. and Mrs. as title 'der Mr. and Mrs.'.
• No moves on the S2 stress grid, Where does Freiherr St John Smith MA start: should a title that is also a particle open the name? #624's title-particle grid, Should Smith, John van der Berg Prof. read title 'Prof.' as John van der Berg Prof. does? #623's given-part grid or Merge the trailing run's particle runs in group, so S2's read needs no BOUND stop or report gathering #625's particle grid.
• Five differential gates: all exit 0.
  • Each 2.x ledger gets a fix(#636) rule.
  • At 1.4.0 the broad fix(comma-family) lone post-comma piece routes to suffix/title rule already explains the new example, and its claim is re-recorded with a dated note.
• Frames: the reference rows and family-comma names don't move. A tail part with a particle costs less (John Smith, Jr., Freiherr von Richthofen 440 → 428).

Tests

• New row a_title_behind_a_particle_run_past_the_second_comma, labelled fix(#636). 1.4.0 and 2.3.0 read suffix 'Jr., van der Berg Prof.'.

• Two new rules.md#C2 examples.

• New rows from the review: Smith, John, van der Berg Prof. and ,, van der Berg Prof. (both fix(#636)). A chain kept after a family comma alone had passed every other test while reverting these readings.

• Negative control: with the chain run in these parts again, 9 tests fail.

  • The three fix(#636) rows, on both surfaces.
  • The two new C2 examples.
  • a_part_past_the_second_reports_no_particle_fork: the handoff no longer suppresses its chain report, so that row now guards the change too.

  With the chain run only after a family comma, the two review rows fail on both surfaces.

Review

Fix commit:

• pins the family-comma and empty-head tails;
• corrects the suffix-comma mechanism claim in the entry, a code comment and a case note;
• removes the now-dead tail half of group's report handoff (nothing moves);
• narrows C2's Accepted paragraph to its report half.

The grid sweep ran under 13 configurations, comparing fields, reports, initials(), capitalized() and the facade's views, and found no reading made worse.

Two gaps were already on master and are recorded in the entry:

• P5's bound join still runs in a tail part after a suffix comma (John Smith, Jr., abdul Dr. Smith): Should John Smith, Jr., abdul Dr. Smith read title 'Dr.' as John Smith, Jr., Berg Dr. Smith does? #640.
• C2's no-name-reading clause is contradicted for the part after a suffix comma by Rethink the suffix-comma rule (C1): decide the comma's structure once, after the words are tagged #613's per-word report: Should John Smith, PhD van der Berg report its words as possible name words, when C2 says a wholly-suffix part raises no such report? #641.

Second fix commit:

• corrects the negative control (9 tests);
• gives the recipes for the suffix-comma grid and the handoff measurement;
• marks Should a credential run after a comma keep its comma when the last word is an ambiguous acronym? John Smith, PhD MEng reads first PhD, last John Smith #544's mechanism superseded;
• opens Should John Smith, Jr., abdul Dr. Smith read title 'Dr.' as John Smith, Jr., Berg Dr. Smith does? #640 and Should John Smith, PhD van der Berg report its words as possible name words, when C2 says a wholly-suffix part raises no such report? #641 in the entry.

Docs

• rules.md#C2: the no-name-reading clause no longer says a particle chain runs over such a part.
• decisions.md#C1: new Should John Smith, Jr., van der Berg Prof. read title 'Prof.' as John Smith, Jr., Prof. does? #636 entry.
• AGENTS.md (the decision-site bullet) and two case-row notes: they said the chain "still runs" in these parts.
• Release log: the Should a comma part opening with a credential be a suffix comma? John Smith, PhD Jones reads family John Smith #603 C2 bullet is extended and now closes Should John Smith, Jr., van der Berg Prof. read title 'Prof.' as John Smith, Jr., Prof. does? #636.

Closes #636

🤖 Generated with Claude Code