fix(admin-scrape): ge=1 on count param + enforce LLM finish_reason (#review-followup)

- admin_scrape.py /failures limit: ge=0 → ge=1 (returning 0 rows is nonsensical for a list endpoint)
- orchestrator.py: check result.finish_reason after ok=True; 'length'/'content_filter' and any
  other non-stop reason triggers deterministic fallback with reason=finish_reason:<value>
  (LLMResult docstring mandated this but no consumer enforced it)

backend/app/api/v1/admin_scrape.py

@@ -268,7 +268,7 @@ def revoke_task(
 def list_failures(
     db: Annotated[Session, Depends(get_db)],
     run_id: int | None = None,
-    limit: int = Query(default=50, ge=0),
+    limit: int = Query(default=50, ge=1),
 ) -> list[dict[str, Any]]:
     """Per-request failure log for manual browser verification."""
     where = ""
@@ -1284,9 +1284,7 @@ _FRESHNESS_SOURCES: list[FreshnessSource] = [
 ]
 
 
-def _classify_freshness(
-    age_days: float | None, fresh_days: float, stale_days: float
-) -> str:
+def _classify_freshness(age_days: float | None, fresh_days: float, stale_days: float) -> str:
     """fresh / stale / critical / unknown по возрасту последнего успешного прогона."""
     if age_days is None:
         return "unknown"

backend/app/services/chat/orchestrator.py

@@ -165,6 +165,18 @@ def orchestrate_chat(
             continue
 
         # Нет tool_calls → финальная проза.
+        # Проверяем finish_reason: 'length' / 'content_filter' означают обрезанный
+        # или отфильтрованный ответ — неполная проза клиенту не отдаётся (LLMResult
+        # docstring §64: «консьюмер ОБЯЗАН проверять даже при ok=True»).
+        if result.finish_reason not in (None, "stop", "end_turn", "tool_calls"):
+            logger.warning(
+                "chat: non-stop finish_reason=%r for cad=%s run=%s → deterministic fallback",
+                result.finish_reason,
+                cad_num,
+                run_id,
+            )
+            return _deterministic(report_dict, message, f"finish_reason:{result.finish_reason}")
+
         answer = (result.content or "").strip()
         if not answer:
             # Модель вернула пустоту — пустой ответ клиенту не отдаём, деградируем.