ГЛОБАЛЬНЫЙ РЕФАКТОРИНГ АРХИТЕКТУРЫ - Рефакторинг этапов 2.2 - Усилена оркестрацию в deep/address гейте и follow-up binding в assistantService.ts. Починен кейс UTF-8 follow-up refinement (теперь followup_state_usage.applied=true в нужном сценарии). Убраны регрессии по assistantLivingRouter и stage3 lifecycle probe. Корректное поведение для llm canonical candidate (чтобы не уезжало в clarification_required там, где должен быть address factual).

llm_normalizer/backend/src/services/assistantDeepTurnNormalizationRuntimeAdapter.ts

@@ -1,5 +1,6 @@
 import type { AssistantMessageRequestPayload } from "../types/assistant";
 import type { NormalizeRequestPayload, NormalizeResponsePayload } from "../types/normalizer";
+import type { InvestigationStateWithProblemUnits } from "../types/stage2ProblemUnits";
 import type { AssistantFollowupUsage } from "./assistantFollowupUsage";
 
 export interface AssistantDeepTurnFollowupBinding {
@@ -13,11 +14,11 @@ export interface BuildAssistantDeepTurnNormalizationRuntimeInput {
   payload: AssistantMessageRequestPayload;
   featureInvestigationStateV1: boolean;
   featureStateFollowupBindingV1: boolean;
-  sessionInvestigationState: unknown | null | undefined;
+  sessionInvestigationState: InvestigationStateWithProblemUnits | null | undefined;
   buildFollowupStateBinding: (input: {
     userMessage: string;
     payloadContext: NormalizeRequestPayload["context"] | undefined;
-    investigationState: unknown;
+    investigationState: InvestigationStateWithProblemUnits;
   }) => AssistantDeepTurnFollowupBinding;
   normalize: (payload: NormalizeRequestPayload) => Promise<NormalizeResponsePayload>;
 }
@@ -31,14 +32,18 @@ export interface BuildAssistantDeepTurnNormalizationRuntimeOutput {
 export async function buildAssistantDeepTurnNormalizationRuntime(
   input: BuildAssistantDeepTurnNormalizationRuntimeInput
 ): Promise<BuildAssistantDeepTurnNormalizationRuntimeOutput> {
-  const followupBinding =
+  const investigationState = input.sessionInvestigationState;
+  const canUseFollowupBinding =
     input.featureInvestigationStateV1 &&
     input.featureStateFollowupBindingV1 &&
-    Boolean(input.sessionInvestigationState)
+    investigationState !== null &&
+    investigationState !== undefined;
+  const followupBinding =
+    canUseFollowupBinding
       ? input.buildFollowupStateBinding({
           userMessage: input.userMessage,
           payloadContext: input.payload.context,
-          investigationState: input.sessionInvestigationState as unknown
+          investigationState
         })
       : {
           normalizedQuestion: input.userMessage,