Add Stage 2.8 recall, quality gate, retries, and publish idempotency

tests/test_clients.py

@@ -1,8 +1,9 @@
 import json
 import unittest
+from urllib.error import HTTPError
 from unittest.mock import patch
 
-from ai_daily_report.clients import BlogApiClient, OpenAICompatibleClient, fetch_text
+from ai_daily_report.clients import FetchTextError, BlogApiClient, OpenAICompatibleClient, fetch_text
 
 
 class FakeResponse:
@@ -26,6 +27,28 @@ class ClientTests(unittest.TestCase):
         with patch("urllib.request.urlopen", return_value=FakeResponse("ok".encode("utf-8"))):
             self.assertEqual(fetch_text("https://example.com", 1), "ok")
 
+    def test_fetch_text_retries_transient_http_errors(self):
+        responses = [
+            HTTPError("https://example.com", 503, "Service Unavailable", {}, None),
+            FakeResponse("ok".encode("utf-8")),
+        ]
+        with patch("urllib.request.urlopen", side_effect=responses) as urlopen:
+            self.assertEqual(fetch_text("https://example.com", 1, retries=1, backoff_seconds=0), "ok")
+
+        self.assertEqual(urlopen.call_count, 2)
+
+    def test_fetch_text_does_not_retry_404_and_classifies_error(self):
+        with patch(
+            "urllib.request.urlopen",
+            side_effect=HTTPError("https://example.com", 404, "Not Found", {}, None),
+        ) as urlopen:
+            with self.assertRaises(FetchTextError) as context:
+                fetch_text("https://example.com", 1, retries=2, backoff_seconds=0)
+
+        self.assertEqual(urlopen.call_count, 1)
+        self.assertEqual(context.exception.error_type, "http_404")
+        self.assertEqual(context.exception.http_status, 404)
+
     def test_openai_compatible_client_returns_message_content(self):
         body = json.dumps({"choices": [{"message": {"content": "hello"}}]}).encode("utf-8")
         with patch("urllib.request.urlopen", return_value=FakeResponse(body)):