652100a9c2
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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