fix: retry transient RSS fetch failures with backoff

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_rss_parse.py

@@ -29,6 +29,42 @@ def test_rss_user_agent_avoids_bot_blocked_feeds():
     assert "daily-robots" not in RSS_USER_AGENT
 
 
+def test_fetch_one_retries_transient_errors(monkeypatch):
+    import httpx
+
+    from daily.news.feeds import NEWS_CATEGORIES
+    from daily.news import fetch as news_fetch
+
+    monkeypatch.setenv("DAILY_RSS_RETRY", "2")
+    monkeypatch.setattr(news_fetch.time, "sleep", lambda _: None)
+
+    category = NEWS_CATEGORIES[0]
+    feed = category.feeds[0]
+    calls = {"n": 0}
+
+    class FakeResponse:
+        def raise_for_status(self):
+            return None
+
+        @property
+        def text(self):
+            return (FIXTURES / "sample-rss.xml").read_text(encoding="utf-8")
+
+    class FakeClient:
+        headers = {"User-Agent": "test"}
+
+        def get(self, url, headers=None):
+            calls["n"] += 1
+            if calls["n"] < 2:
+                raise httpx.RemoteProtocolError("Server disconnected")
+            return FakeResponse()
+
+    entries, ok = news_fetch._fetch_one(FakeClient(), category, feed)
+    assert ok is True
+    assert len(entries) == 1
+    assert calls["n"] == 2
+
+
 def test_fetch_ai_news_offline(monkeypatch):
     from daily.news import fetch as news_fetch