feat: 添加记忆数量检查，避免在保留数不足时进行整理

src/gateway/memory_maintenance.rs

@@ -132,6 +132,18 @@ impl MemoryMaintenanceService {
             return Ok(None);
         }
 
+        // 记忆数量不足最小保留数时，无需整理，直接跳过
+        // 避免浪费 LLM token 并触发无意义的 "保留数不足" 错误
+        if memories.len() < self.maintenance_config.min_memories_to_keep {
+            tracing::info!(
+                scope_key = %scope_key,
+                count = memories.len(),
+                min_required = self.maintenance_config.min_memories_to_keep,
+                "Skipping scope: not enough memories to organize"
+            );
+            return Ok(None);
+        }
+
         Ok(Some(build_memory_maintenance_plan(&memories)))
     }
 
@@ -619,6 +631,9 @@ pub(crate) fn is_recoverable_maintenance_llm_error(error: &str) -> bool {
         || normalized.contains("stream timeout")
         || normalized.contains("timed out")
         || normalized.contains("timeout")
+        // 验证拒绝 — 记忆太少，跳过本次 scope 即可，不应视为作业失败
+        || error.contains("保留数不足")
+        || error.contains("合并比例超限")
 }
 
 fn is_recoverable_maintenance_scope_error(error: &AgentError) -> bool {