feat(intraday): add discovery and verification watch pipeline

scripts/testdata/intraday_discovery_search_sample.json

@@ -0,0 +1,18 @@
+[
+  {
+    "title": "OpenAI announces GPT-5.6 preview pricing update",
+    "summary": "OpenAI preview announcement mentions GPT-5.6 and updated API pricing references.",
+    "url": "https://openai.example.com/news/gpt-5-6-pricing",
+    "provider": "OpenAI",
+    "provider_url": "https://openai.example.com",
+    "published_at": "2026-05-25T09:00:00Z"
+  },
+  {
+    "title": "DeepSeek launches V4 Flash campaign",
+    "summary": "Campaign page suggests temporary promotional pricing for DeepSeek-V4-Flash.",
+    "url": "https://deepseek.example.com/campaign/v4-flash",
+    "provider": "DeepSeek",
+    "provider_url": "https://deepseek.example.com",
+    "published_at": "2026-05-25T10:00:00Z"
+  }
+]