AC2 — intra-family marriage. When two parented persons at the same
imported generation are spouses but live in separate sibling blocks
(each under their own parent), the block-packer used to leave them
split, drawing a long spouse line that crossed through any intervening
siblings. The new step 3.5 detects that case, moves the focal members
to the join boundary (A's spouse rightmost in A's block, B's spouse
leftmost in B's), and concatenates B's members onto A's; the combined
block centres on the average of the two parents' midpoints.
Latent against today's data (no intra-family marriage in the canonical
fixture); covered by a synthetic two-family scenario in
buildLayout.test.ts. Packer growth stays comfortably under Markus's
80-LoC extraction threshold, so packBlocks.ts is not yet warranted.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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