test(dmsk): 季末日历炸弹拆除——canary/notice 两测锚日 FakeDate 固定, 治 09-30 当天 CI 必红 [nas] [no-doc]

canary=periods[1] 随墙钟翻页(Q3 末 09-30 入期集合, 次新变 06-30, 空 03-31 不再触发 rc=1);
notice_filter 的 today not in pdirs 在季末当天必炸(dt=2026-09-30 是合法 REPORT_DATE 落点).
锚日=2026-09-08 非季末, 文件内 test_daily_marker_date_scoped 同款 FakeDate 工法.

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

tests/data_platform/test_fundamentals_dmsk_download.py

@@ -241,6 +241,18 @@ def test_in_batch_dedup_same_key_twice_in_response(root, monkeypatch):
 
 def test_backfill_canary_empty_fails_and_never_marks(root, monkeypatch):
     # 次新期空=契约漂移疑云: failed+1, 不标 done 不落空库
+    # 季末位面坑(09-30 CI 实案): canary=periods[1] 随墙钟翻页——Q3 末当天
+    # 09-30 入期集合, 次新变 06-30, 空 03-31 不再触发 rc=1. 锚日=非季末
+    # (文件先例 test_daily_marker_date_scoped 同款 FakeDate).
+    real_date = dt.date
+
+    class FakeDate(real_date):
+        @classmethod
+        def today(cls):
+            return real_date(2026, 9, 8)
+
+    monkeypatch.setattr(fdd.dt, "date", FakeDate)
+
     def responder(d, p):
         return [] if p == "2026-03-31" else [_raw(period=p + " 00:00:00")]
     _patch_fetch(monkeypatch, responder)
@@ -280,7 +292,18 @@ def test_limit_never_marks(root, monkeypatch):
 # ---------- daily lane ----------
 
 def test_daily_notice_filter_and_period_dir(root, monkeypatch):
-    today = dt.date.today()
+    # 季末位面坑(09-30 CI 实案): 相对墙钟 today 会在 Q3 末当天撞进期集合
+    # (dt=2026-09-30 是合法 REPORT_DATE 落点, "today not in pdirs" 必炸).
+    # 锚日=非季末, 期集合与 notice 窗全相对锚日构造.
+    real_date = dt.date
+
+    class FakeDate(real_date):
+        @classmethod
+        def today(cls):
+            return real_date(2026, 9, 8)
+
+    monkeypatch.setattr(fdd.dt, "date", FakeDate)
+    today = FakeDate.today()
     fresh = (today - dt.timedelta(days=1)).isoformat()
     stale = (today - dt.timedelta(days=30)).isoformat()