Improve AI daily report operations and dedupe observability

docs/ops-thresholds.generated.md

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+# AI日报运维阈值（自动生成）
+
+> 由 `scripts/generate_ops_docs.py` 从 `config/pipeline.json` 和 `config/sources.json` 生成；不要手改本文件。
+
+## Quality Gate
+
+- `block_on_required_source_failure`: `True`
+- `required_source_failure_policy`: `block`
+- `required_sources`: `['AI HOT']`
+- `warn_on_enabled_source_failure`: `True`
+- `warn_on_entity_frequency`: `3`
+- `warn_on_final_title_similarity`: `0.55`
+- `warn_when_stage3_candidates_zero_min_items`: `30`
+
+## Semantic Candidate Recall
+
+- `enabled`: `True`
+- `max_pairs`: `80`
+- `max_pairs_per_item`: `5`
+- `strong_entity_overlap_threshold`: `2`
+- `summary_jaccard_threshold`: `0.18`
+- `title_jaccard_threshold`: `0.25`
+- `title_similarity_threshold`: `0.45`
+
+## Sources
+
+| source | required | failure_policy | min_items | retries | timeout_seconds |
+|---|---:|---|---:|---:|---:|
+| AI HOT | True | block | 10 | 2 | 25 |
+| 橘鸦AI早报 | False | warn | 0 | 2 | 45 |
+| 量子位 | False | warn | 0 | 1 | 25 |
+| InfoQ AI | False | warn | 0 | 1 | 25 |
+| MIT科技评论AI | False | warn | 0 | 1 | 25 |