真实数据集扩产与被动语料接入

- scripts/expand_real_dataset.py：AutoWeakS 全量 2215 条 + 500 条分层评测集 + 简历扩量（seed=2026 可复现）
- pipeline 被动语料机制（passive_sources）：真实无日期 JD 参与接入/清洗/抽取验证（2915 条命中率 99.8%），不进图谱/演化/发现
- 新岗位发现第四指标'差异度'与双年窗口增长率口径
- 评测新增 real_jd_500 维度（99.91%）；测试会话隔离 jd_extra_dirs 防止本机配置拖慢套件

reports/metrics.json

@@ -318,12 +318,31 @@
   "samples": 200,
   "bad_lines": 0
  },
+ "real_jd_500": {
+  "accuracy": 0.9991,
+  "title_accuracy": 1.0,
+  "fields": {
+   "required_skills": {
+    "precision": 1.0,
+    "recall": 0.998,
+    "f1": 0.999
+   },
+   "preferred_skills": null,
+   "scenarios": {
+    "precision": 1.0,
+    "recall": 1.0,
+    "f1": 1.0
+   }
+  },
+  "samples": 500,
+  "bad_lines": 0
+ },
  "real_resume": {
   "accuracy": 1.0,
   "name_accuracy": 1.0,
   "phone_accuracy": 1.0,
-  "samples": 50,
-  "phone_samples": 50,
-  "empty_skill_resumes": 28
+  "samples": 200,
+  "phone_samples": 200,
+  "empty_skill_resumes": 113
  }
 }