Архитектура: централизовать selected-item carryover в continuity policy и transition glue

llm_normalizer/backend/src/services/assistantTransitionPolicy.ts

@@ -3,6 +3,7 @@ import {
   applyHistoricalPartyCarryoverFilters,
   applyOrganizationCarryoverFilters,
   applyReferencedEntityCarryover,
+  applySelectedItemCarryover,
   applyTemporalCarryoverFilters,
   buildRootScopedCarryoverFilters,
   buildInventoryRootFrameFromAddressDebug,
@@ -874,10 +875,16 @@ export function createAssistantTransitionPolicy(deps) {
       rootScopedPivot,
       deps.toNonEmptyString
     ));
-    if (
-      !rootScopedPivot &&
-      !deps.toNonEmptyString(previousFilters.item) &&
-      (sourceIntentHint === "inventory_on_hand_as_of_date" ||
+    ({
+      previousFilters,
+      previousAnchorType,
+      previousAnchorValue: previousAnchor
+    } = applySelectedItemCarryover(
+      previousFilters,
+      previousAnchorType,
+      previousAnchor,
+      rootScopedPivot,
+      sourceIntentHint === "inventory_on_hand_as_of_date" ||
         sourceIntentHint === "inventory_purchase_provenance_for_item" ||
         sourceIntentHint === "inventory_purchase_documents_for_item" ||
         sourceIntentHint === "inventory_sale_trace_for_item" ||
@@ -885,19 +892,13 @@ export function createAssistantTransitionPolicy(deps) {
         sourceIntentHint === "inventory_purchase_to_sale_chain" ||
         sourceIntentHint === "inventory_aging_by_purchase_date" ||
         hasSelectedObjectInventorySignalPrimary ||
-        hasSelectedObjectInventorySignalAlternate)
-    ) {
-      const selectedObjectLabel =
-        (navigationFocusObjectType === "item" ? navigationFocusObjectLabel : null) ??
-        continuitySnapshot.activeItem ??
-        extractSelectedObjectLabel(userMessage) ??
-        (deps.toNonEmptyString(alternateMessage) ? extractSelectedObjectLabel(String(alternateMessage ?? "")) : null);
-      if (selectedObjectLabel) {
-        previousFilters.item = selectedObjectLabel;
-        previousAnchorType = "item";
-        previousAnchor = selectedObjectLabel;
-      }
-    }
+        hasSelectedObjectInventorySignalAlternate,
+      navigationFocusObjectType === "item" ? navigationFocusObjectLabel : null,
+      continuitySnapshot.activeItem,
+      extractSelectedObjectLabel(userMessage),
+      deps.toNonEmptyString(alternateMessage) ? extractSelectedObjectLabel(String(alternateMessage ?? "")) : null,
+      deps.toNonEmptyString
+    ));
     if (explicitOrganizationClarificationSelection && !previousAnchor) {
       previousAnchorType = "organization";
       previousAnchor = explicitOrganizationClarificationSelection;