feat(migration): add Migrate-To-V2.ps1 idempotent migration runner

scripts/migration/count-rows.sql

@@ -0,0 +1,26 @@
+-- Per-table row counts for pre/post-migration audit.
+-- Covers every table relevant to the v1 -> v2 transition so the operator can confirm
+-- live-edit data was preserved and v2 tables came up empty.
+
+SELECT TableName = t.name, [Rows] = SUM(p.[rows])
+FROM   sys.tables t
+JOIN   sys.partitions p ON p.object_id = t.object_id AND p.index_id IN (0,1)
+WHERE  t.name IN (
+    -- Live-edit configuration (rows must survive)
+    'ServerCluster','ClusterNode','ClusterNodeCredential',
+    'Namespace','UnsArea','UnsLine',
+    'DriverInstance','Device','Equipment','Tag','PollGroup','VirtualTag',
+    'NodeAcl','ExternalIdReservation',
+    'Script','ScriptedAlarm','ScriptedAlarmState',
+    'LdapGroupRoleMapping',
+    'EquipmentImportBatch','EquipmentImportRow',
+    -- Status tables (rebuilt at runtime; counts informational)
+    'DriverHostStatus','DriverInstanceResilienceStatus',
+    -- Audit (preserved)
+    'ConfigAuditLog',
+    -- v2 deploy model (empty pre-migration, populated post)
+    'Deployment','NodeDeploymentState','ConfigEdit','DataProtectionKeys'
+)
+GROUP BY t.name
+ORDER BY t.name;
+GO