feat(composite): 三路对拍前端可见性——合成层页第二卡(三路对比表+规则判读+特征贡献+冗余chips+空态)+GET challenge 端点(最新件/坏件skip);修 challenger CLI 断链(__main__ guard 缺失=python -m 静默空跑,11-01 stage6 必空,部署验证现场抓获);spec §4.4 落账含 QA 无合成 UI 核实 [vps]

sanguo_api/routes_pipeline.py

@@ -945,6 +945,39 @@ def composite(family: str | None = None) -> dict:
             "items": [challenger, incumbent]}
 
 
+@router.get("/pipeline/composite/challenge")
+def composite_challenge() -> dict:
+    """三路对拍最新件(等权/ICIR/LGBM 影子实验,spec §4.4 决议 O 前置可視性).
+
+    读报告根 challenger_lgbm/ 子目录(challenger_lgbm.py 产物,月度链 stage6
+    每月覆盖);多件取 as_of 最大,坏件 skip 留痕.无件=空态(11-01 首考),
+    前端显示"暂无对拍数据"——不造数.
+    """
+    import glob as _glob
+
+    sub = os.path.join(_monthly_dir(), "challenger_lgbm")
+    docs: list[tuple[str, str, dict]] = []  # (as_of, file, doc)
+    for p in sorted(_glob.glob(os.path.join(sub, "*.json"))):
+        try:
+            with open(p, encoding="utf-8") as f:
+                d = json.load(f)
+            as_of = str(d.get("as_of") or "")
+            if as_of:
+                docs.append((as_of, os.path.basename(p), d))
+        except Exception as exc:  # 坏件 skip: 对拍件非权威数据面,宁缺勿崩
+            logger.warning("challenge 对拍件坏件 skip %s: %s", p, exc)
+    if not docs:
+        return {"challenge": None,
+                "available": [],
+                "note": "暂无对拍数据——月度链 stage6 每月产出"
+                        "(11-01 首考);challenger 永不进生产(影子实验)"}
+    docs.sort(key=lambda t: t[0])  # as_of 字典序=时间序
+    _, fname, doc = docs[-1]
+    doc["file"] = fname
+    return {"challenge": doc, "available": [f for _, f, _ in docs],
+            "note": ""}
+
+
 # —— P4-1 假设卡片向导(决议 M:LLM 只做文字→结构,draft 不落库,确认才落) ——
 
 _DRAFT_SENTENCE_MAX = 500