修复: gen_stream判重+重试分类+状态机最短路径+既有测试修复

crates/df-types/src/types.rs

@@ -353,6 +353,8 @@ pub enum TaskStatus {
     Blocked,
     /// 已取消
     Cancelled,
+    /// 已暂缓
+    Deferred,
 }
 
 impl TaskStatus {
@@ -369,6 +371,7 @@ impl TaskStatus {
             TaskStatus::Done => "done",
             TaskStatus::Blocked => "blocked",
             TaskStatus::Cancelled => "cancelled",
+            TaskStatus::Deferred => "deferred",
         }
     }
 
@@ -378,7 +381,7 @@ impl TaskStatus {
     pub fn is_valid(s: &str) -> bool {
         matches!(
             s,
-            "todo" | "in_progress" | "in_review" | "testing" | "done" | "blocked" | "cancelled"
+            "todo" | "in_progress" | "in_review" | "testing" | "done" | "blocked" | "cancelled" | "deferred"
         )
     }
 
@@ -392,6 +395,7 @@ impl TaskStatus {
             "done",
             "blocked",
             "cancelled",
+            "deferred",
         ]
     }
 
@@ -408,6 +412,7 @@ impl TaskStatus {
             "done" => TaskStatus::Done,
             "blocked" => TaskStatus::Blocked,
             "cancelled" => TaskStatus::Cancelled,
+            "deferred" => TaskStatus::Deferred,
             _ => return None,
         })
     }
@@ -598,6 +603,7 @@ mod tests {
         assert!(TaskStatus::is_valid("done"));
         assert!(TaskStatus::is_valid("blocked"));
         assert!(TaskStatus::is_valid("cancelled"));
+        assert!(TaskStatus::is_valid("deferred"));
     }
 
     // as_str 与 is_valid 必须自洽：每个变体的存储值都应被 is_valid 接受
@@ -611,6 +617,7 @@ mod tests {
             TaskStatus::Done,
             TaskStatus::Blocked,
             TaskStatus::Cancelled,
+            TaskStatus::Deferred,
         ];
         for v in all {
             assert!(
@@ -673,7 +680,7 @@ mod tests {
             assert!(TaskStatus::is_valid(v), "valid_values 含 {:?} 但 is_valid 拒绝", v);
         }
         // 数量应等于枚举变体数
-        assert_eq!(TaskStatus::valid_values().len(), 7);
+        assert_eq!(TaskStatus::valid_values().len(), 8);
     }
 
     // ── Priority::from_i32（对齐前端约定 0=Critical/1=High/2=Medium/3=Low）──