fix(version_pipeline): 添加 mark_failed() 方法 + 测试用例

TesterAgent 测试失败时需调用 mark_failed() 将版本状态置为 abandoned，
补充缺失的 anti-hallucination 门控方法（使用 done_at 字段记录时间戳）。

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/nmfs_agents/tools/version_pipeline.py

@@ -144,6 +144,16 @@ class VersionPipeline:
             )
             logger.info("[%s] %s 测试通过，已完成", project, version)
 
+    def mark_failed(self, project: str, version: str, issue: str = "") -> None:
+        """测试失败，标记为 abandoned（由 TesterAgent 调用）。"""
+        with self._connect() as conn:
+            conn.execute(
+                "UPDATE versions SET status='abandoned', done_at=? "
+                "WHERE project=? AND version=?",
+                (self._now(), project, version),
+            )
+        logger.info("[%s] %s 测试失败: %s", project, version, issue[:100])
+
     # ─── 查询 ──────────────────────────────────────────────────────
 
     def get_status(self, project: str) -> list[dict]:

tests/test_version_gate.py

@@ -31,6 +31,18 @@ def test_tester_agent_can_mark_version_done(tmp_path):
     assert status[0]["status"] == "done"
 
 
+def test_mark_failed_sets_abandoned(tmp_path):
+    """TesterAgent 调用 mark_failed 后版本状态变为 abandoned。"""
+    vp = VersionPipeline(db_path=tmp_path / "vp.db")
+    vp.start_version("antishake", "v1", "test")
+    vp.start_testing("antishake", "v1")
+    vp.mark_failed("antishake", "v1", issue="jitter_px=8 超限")
+
+    status = vp.get_status("antishake")
+    assert status[0]["status"] == "abandoned"
+    assert status[0]["done_at"] is not None
+
+
 def test_dev_agent_cannot_directly_mark_done(tmp_path):
     """开发 agent 的 [测试通过] 标签应被系统忽略（不能直接调 mark_done）。