feat: accept ERP-semantic roster workbook headers

mappings/lifecycle.mapping.json

@@ -195,7 +195,7 @@
       "full_replace requires confirmed=true and forces a native overwrite of every supplied sequence even when its current persisted projection is equal; the plugin must not downgrade confirmed user intent to no_changes",
       "passenger_list.marker is exactly TEST-202609 only for an explicit historical test context",
       "every source row has 证件类型 exactly 护照",
-      "the workbook header is exactly row 2; row 1 is group metadata and never enters canonical TSV",
+      "exactly one workbook row within the first 100 rows maps to the required ERP passenger fields; the header may be row 1 or follow metadata rows, source order is arbitrary, approved source/ERP aliases map to one semantic field each, and unknown or unheaded data columns are rejected; contiguous roster data is read below the detected header",
       "at most one row has trimmed 备注 exactly 领队; that row requires nonblank 姓名 and 电话 and must match passenger_list.leader_contact"
     ],
     "native_defects": [