Assigns every person to one unit: a primary, or a spouse absorbed into the primary's run (marriage-year order, #361 preserved). Wires the parent/child hierarchy from each primary's structural-owner parent and records displaced parent edges as cross-links (classified same-level vs cross-level for later distinct rendering). Unknown-id guard covers PARENT_OF and SPOUSE_OF. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>