A cold read caught the subtraction pass emitting broken English:
'Nobody — but the bells are moving is a summons is being rung...'. The opener
template assumed occupant was a noun phrase and doing was a participle; ten
situations broke that, and one occupant carried its own clause.
Root cause fixed in the data, not the template. The template also drops its
hardcoded copula for an em-dash appositive, which removes subject-verb
agreement as a failure mode entirely — 'The bells is ringing' cannot recur.
Three invariants now guard it: occupants carry no verb, actions are participle
phrases, and no rendered opener contains a stray copula. The first version of
that last test was wrong rather than the output — it counted em-dashes and
flagged 191 false positives on cue fragments that legitimately contain one.
The audit regex also had a false negative, since 'something' ends in -ing.
Tests 25 -> 28.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
tevansandClaude Opus 5
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