Harden Linear XLSX end to end

docs/project-history-and-external-model-architecture.md

@@ -116,8 +116,8 @@ Implemented automatic-snapshot policy:
 
 Phase 14 is active and follows the
 [Linear-Excel requirements](spec/revit-excel-integration-requirements.md) and
-[R0–R10 plan](spec/revit-excel-phase-14-plan.md). The existing CSV/IFCGUID
-runtime is a legacy starting point for the cutover, not the target model.
+[R0–R10 plan](spec/revit-excel-phase-14-plan.md). The CSV/IFCGUID runtime has
+been removed; the implemented runtime uses Linear XLSX and exact Worksharing-ID.
 
 External model exchange should use explicit staging and link entities instead of writing imported rows directly into circuits.
 
@@ -152,6 +152,12 @@ Required behavior:
 - Missing objects and duplicate/conflicting Worksharing-IDs are reported,
   never silently reassigned.
 
+R10 verifies the complete implemented path through initial import, planning,
+row assignment, return workbook, follow-up import, snapshot restore, portable
+duplicate and restart-safe Undo/Redo. Large state replacement uses bounded
+SQLite insert batches so imports, restores and duplicates do not exceed the
+driver's SQL-variable limit.
+
 The project configuration has no separate revision counter. Stateless plans
 and apply requests bind to `expectedRevision`; every applied import batch holds
 its configuration copy. Apply reparses the retransmitted workbook. Undo and