fix: reclassify BU reassignment round-trips and fix backfill date-ordering bug

backend/routes/ivantiFindings.js

@@ -315,10 +315,11 @@ async function detectArchiveChanges(db, previousFindings, currentFindings) {
     const returnClassification = { bu_reassignment: 0, severity_drift: 0, closed_on_platform: 0, decommissioned: 0 };
     for (const archiveId of returnedArchiveIds) {
         try {
-            // Find the most recent ARCHIVED transition reason for this archive record
+            // Find the most recent ARCHIVED transition reason *before* this return
             const transition = await dbGet(db,
                 `SELECT reason FROM ivanti_archive_transitions
                  WHERE archive_id = ? AND to_state = 'ARCHIVED'
+                   AND transitioned_at <= datetime('now')
                  ORDER BY transitioned_at DESC LIMIT 1`,
                 [archiveId]
             );