feat: always sync full 24 months horizon of contingents

src/Entity/Groups/ContingentSyncState.php

@@ -159,8 +159,9 @@ class ContingentSyncState
     /**
      * Records a successful sync of a window ending at $horizonTo.
      *
-     * The horizon only ever grows: the near-term job runs far more often than the full-horizon
-     * one, and must not discard the reach the latter established.
+     * The horizon only ever grows, so an ad-hoc run over a narrow window — say
+     * `--horizon-months=1` while debugging — cannot discard the reach the scheduled full sync
+     * established.
      */
     public function recordSuccess(\DateTimeImmutable $syncedAt, \DateTimeImmutable $horizonTo): self
     {