fix(db): join the two migration branches left on main - #2567

🟢 Confidence 10/10 · safe to merge. Empty-body merge migration whose snapshot I diffed as the exact union of both parents, restoring the existing parity test.
_{no findings · tests covered · risk high}

Adds a custom merge migration (20261113150230_merge_cost_connections_audit_detection) with no SQL that joins the cost_connections and alert_rules_audit_detection heads, restoring the single-head invariant parity.test.ts enforces. The snapshot is the exact union of both parent snapshots, so it is safe to merge.

• 20261113150230_merge_cost_connections_audit_detection has both prior heads as prevIds and an empty migration body

Before merge

• Migration · Check it is safe on production data and with the code still deployed · packages/db/drizzle/20261113150230_merge_cost_connections_audit_detection/migration.sql

_{ee2d5f4 · Reply "won't fix" to dismiss a finding, or mention @maple-review-bot to ask about one.}