ARCH: добавить вывод длительности активности MCP discovery

llm_normalizer/backend/tests/assistantMcpDiscoveryAnswerAdapter.test.ts

@@ -35,7 +35,9 @@ describe("assistant MCP discovery answer adapter", () => {
     expect(draft.internal_mechanics_allowed).toBe(false);
     expect(draft.headline).toContain("подтвержденная активность");
     expect(draft.confirmed_lines[0]).toContain("SVK");
-    expect(draft.inference_lines[0]).toContain("may be inferred");
+    expect(draft.inference_lines[0]).toContain("меньше месяца");
+    expect(draft.inference_lines.join("\n")).toContain("Первая найденная активность: 2020-01-15");
+    expect(draft.inference_lines.join("\n")).toContain("не юридически подтвержденный возраст регистрации");
     expect(draft.unknown_lines).toContain("Legal registration date is not proven by this MCP discovery pilot");
     expect(draft.must_not_claim).toContain("Do not present inferred activity duration as a formally confirmed legal fact.");
     expect(draft.reason_codes).toContain("answer_contains_unknown_fact_boundary");
@@ -106,4 +108,30 @@ describe("assistant MCP discovery answer adapter", () => {
     expect(userFacing).not.toContain("ВЫБРАТЬ");
     expect(userFacing).not.toContain("primitive");
   });
+
+  it("verbalizes activity duration from first and latest confirmed 1C rows", async () => {
+    const planner = planAssistantMcpDiscovery({
+      turnMeaning: {
+        asked_domain_family: "counterparty_lifecycle",
+        asked_action_family: "activity_duration",
+        explicit_entity_candidates: ["SVK"]
+      }
+    });
+    const pilot = await executeAssistantMcpDiscoveryPilot(
+      planner,
+      buildDeps([
+        { Period: "2020-01-15T00:00:00", Counterparty: "SVK" },
+        { Period: "2023-12-20T00:00:00", Counterparty: "SVK" }
+      ])
+    );
+
+    const draft = buildAssistantMcpDiscoveryAnswerDraft(pilot);
+    const inferenceText = draft.inference_lines.join("\n");
+
+    expect(inferenceText).toContain("3 года 11 месяцев");
+    expect(inferenceText).toContain("2020-01-15");
+    expect(inferenceText).toContain("2023-12-20");
+    expect(inferenceText).toContain("не юридически подтвержденный возраст регистрации");
+    expect(draft.reason_codes).toContain("pilot_derived_activity_period_from_confirmed_rows");
+  });
 });

llm_normalizer/backend/tests/assistantMcpDiscoveryPilotExecutor.test.ts

@@ -39,7 +39,18 @@ describe("assistant MCP discovery pilot executor", () => {
     expect(result.evidence.inferred_facts[0]).toContain("may be inferred");
     expect(result.evidence.unknown_facts).toContain("Legal registration date is not proven by this MCP discovery pilot");
     expect(result.source_rows_summary).toBe("2 MCP document rows fetched, 2 matched lifecycle scope");
+    expect(result.derived_activity_period).toEqual({
+      first_activity_date: "2020-01-15",
+      latest_activity_date: "2023-12-20",
+      matched_rows: 2,
+      duration_total_months: 47,
+      duration_years: 3,
+      duration_months_remainder: 11,
+      duration_human_ru: "3 года 11 месяцев",
+      inference_basis: "first_and_latest_confirmed_1c_activity_rows"
+    });
     expect(result.reason_codes).toContain("pilot_query_documents_mcp_executed");
+    expect(result.reason_codes).toContain("pilot_derived_activity_period_from_confirmed_rows");
 
     expect(deps.executeAddressMcpQuery).toHaveBeenCalledTimes(1);
     const call = deps.executeAddressMcpQuery.mock.calls[0]?.[0];
@@ -100,6 +111,7 @@ describe("assistant MCP discovery pilot executor", () => {
     expect(result.mcp_execution_performed).toBe(true);
     expect(result.evidence.evidence_status).toBe("insufficient");
     expect(result.evidence.confirmed_facts).toEqual([]);
+    expect(result.derived_activity_period).toBeNull();
     expect(result.query_limitations).toContain("MCP fetch failed: timeout");
     expect(result.reason_codes).toContain("pilot_query_documents_mcp_error");
   });