Replaces the alternating-side insertOnRight rule with a sort-and-splice
that places every loose spouse to the right of the parented focal in
(fromYear ASC NULLS LAST, displayName ASC) order. Mirrored in step 3 for
the all-loose chained merge so Albert de Gruyter's four marriages land
in deterministic alphabetical order today (no fromYear populated in the
canonical dataset) and switch automatically to year-order as the
transcription pipeline backfills marriage years.
PersonNodeDTO carries only displayName, not parsed first/last names, so
the tiebreaker uses displayName rather than the (lastName, firstName)
key in the original UX brief. The canonical alphabetical order matches
in both schemes — the rule activates the moment a multi-spouse case has
mixed display-name patterns.
Retires the temporary commit-3 scaffold
`attaches_loose_multi_spouse_to_parented_partner_when_edge_order_clobbers`
which became position-arithmetic-equivalent under the new right-of-focal
rule; the two new sort tests are stronger discriminators for the same
behaviour.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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