Stop new prospect<->conversation person splits at the writer

Writer fix: a new conversation for an already-resolved prospect reuses that prospect's Person; nightly spine-health split count does not grow after deploy; then extend merge-split-prospect-persons.ts dry-run for sentinel-vs-sentinel. No prod writes.

Status is DERIVED from each row’s own PR, decision and prod-evidence links by bin/refresh-tracker spine-split-writer — never typed. Last refreshed 2026-11-04 22:37Z.

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Every row opens: when it was added, why it exists, and the links that prove it. Rows waiting on a human carry a Decide → link straight to the answerable question on the decisions page. Statuses are re-derived from live PR, decision and prod-evidence state by bin/refresh-trackers; nothing here is typed by hand. Merged and shipped both count as done (Gera, 2026-10-19); a prod_evidence permalink is what moves a row from Merged to Shipped.

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