Improve AI daily report operations and dedupe observability

tests/fixtures/history_replay_2026_06_04_2026_06_10.json

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+{
+  "date_range": ["2026-06-04", "2026-06-10"],
+  "purpose": "Historical replay fixtures for semantic candidate recall, Stage 3 merge_groups, and cross-day regression tests.",
+  "events": [
+    {
+      "event_id": "claude-fable-mythos",
+      "title": "Claude Fable/Mythos",
+      "expected_behavior": "same_event_merge_or_dedupe",
+      "items": [
+        {
+          "date": "2026-06-04",
+          "id": "claude-fable-1",
+          "source": "AI HOT",
+          "title_raw": "Anthropic 推出 Claude Fable，用长篇叙事测试模型记忆",
+          "summary_raw": "Claude Fable 面向长篇故事生成，强调角色一致性和上下文管理。",
+          "url": "https://example.com/claude-fable"
+        },
+        {
+          "date": "2026-06-05",
+          "id": "claude-mythos-1",
+          "source": "InfoQ AI",
+          "title_raw": "Claude Mythos/Fable 项目扩展到多角色故事工作流",
+          "summary_raw": "报道从创作流程角度补充 Anthropic Fable/Mythos 的应用场景。",
+          "url": "https://example.com/claude-mythos"
+        }
+      ]
+    },
+    {
+      "event_id": "openclaw-suno",
+      "title": "OpenClaw/Suno",
+      "expected_behavior": "same_event_merge_or_dedupe",
+      "items": [
+        {"date": "2026-06-05", "id": "openclaw-suno-1", "source": "AI HOT", "title_raw": "OpenClaw 集成 Suno 音乐生成能力", "summary_raw": "OpenClaw 新版加入 Suno 风格的音乐生成入口。", "url": "https://example.com/openclaw-suno-a"},
+        {"date": "2026-06-05", "id": "openclaw-suno-2", "source": "量子位", "title_raw": "Suno 能力进入 OpenClaw，开源智能体开始做音乐", "summary_raw": "量子位从开源智能体生态角度报道 OpenClaw 与 Suno 相关能力。", "url": "https://example.com/openclaw-suno-b"}
+      ]
+    },
+    {
+      "event_id": "magenta-realtime-2",
+      "title": "Magenta RealTime 2",
+      "expected_behavior": "same_event_merge_or_dedupe",
+      "items": [
+        {"date": "2026-06-06", "id": "magenta-rt2-1", "source": "AI HOT", "title_raw": "Google 发布 Magenta RealTime 2，主打实时音乐生成", "summary_raw": "Magenta RealTime 2 降低延迟，支持互动式音乐创作。", "url": "https://example.com/magenta-rt2-a"},
+        {"date": "2026-06-06", "id": "magenta-rt2-2", "source": "MIT科技评论AI", "title_raw": "Magenta RealTime 2 shows live AI music co-creation", "summary_raw": "MIT Tech Review explains the latency and interaction improvements in Magenta RealTime 2.", "url": "https://example.com/magenta-rt2-b"}
+      ]
+    },
+    {
+      "event_id": "open-code-review",
+      "title": "Open Code Review",
+      "expected_behavior": "same_event_merge_or_dedupe",
+      "items": [
+        {"date": "2026-06-07", "id": "open-code-review-1", "source": "AI HOT", "title_raw": "Open Code Review 发布，开源代码审查智能体上线", "summary_raw": "Open Code Review 面向 GitHub/Gitea 仓库自动生成审查意见。", "url": "https://example.com/open-code-review-a"},
+        {"date": "2026-06-07", "id": "open-code-review-2", "source": "InfoQ AI", "title_raw": "Open Code Review brings agentic review to open-source repos", "summary_raw": "InfoQ focuses on CI integration and review workflows for Open Code Review.", "url": "https://example.com/open-code-review-b"}
+      ]
+    },
+    {
+      "event_id": "openai-chip-talent-move",
+      "title": "OpenAI 芯片成员跳槽",
+      "expected_behavior": "same_event_merge_or_dedupe",
+      "items": [
+        {"date": "2026-06-08", "id": "openai-chip-1", "source": "AI HOT", "title_raw": "OpenAI 定制芯片核心成员跳槽 Anthropic", "summary_raw": "OpenAI 芯片团队关键工程师在量产前离职加入 Anthropic。", "url": "https://example.com/openai-chip-a"},
+        {"date": "2026-06-08", "id": "openai-chip-2", "source": "量子位", "title_raw": "OpenAI 芯片核心叛逃 Anthropic，就在量产前夜", "summary_raw": "量子位强调人才流动对 OpenAI 自研芯片进度的潜在影响。", "url": "https://example.com/openai-chip-b"}
+      ]
+    },
+    {
+      "event_id": "amap-abot",
+      "title": "高德 ABot",
+      "expected_behavior": "same_event_merge_or_dedupe",
+      "items": [
+        {"date": "2026-06-10", "id": "amap-abot-1", "source": "AI HOT", "title_raw": "高德推出 ABot，地图入口接入智能体服务", "summary_raw": "高德 ABot 将出行、搜索和本地生活任务整合到地图智能体。", "url": "https://example.com/amap-abot-a"},
+        {"date": "2026-06-10", "id": "amap-abot-2", "source": "橘鸦AI早报", "title_raw": "高德 ABot 上线，本地生活智能体开始进入地图", "summary_raw": "橘鸦从产品入口角度记录高德 ABot 的上线。", "url": "https://example.com/amap-abot-b"}
+      ]
+    }
+  ]
+}