feat: add online evolution loop and 5% gray risk-policy rollout

config/evolution_candidate.json

@@ -0,0 +1,63 @@
+{
+  "version": "candidate-20260228_220131",
+  "created_at": "2026-02-28T22:01:32",
+  "sample_file": "D:\\main\\tw\\evolution\\artifacts\\samples_20260228_220131.jsonl",
+  "eval_file": "D:\\main\\tw\\evolution\\artifacts\\eval_report_20260228_220131.json",
+  "proposal_file": "D:\\main\\tw\\evolution\\artifacts\\proposals_20260228_220131.json",
+  "gate_report": {
+    "sample_count": 132,
+    "high_findings": 1,
+    "high_findings_rate": 0.0076,
+    "runtime": {
+      "window_hours": 24,
+      "counts": {
+        "inbound_msg": 29,
+        "quote_generated": 1,
+        "transfer_to_human": 1,
+        "system_inquiry_detected": 15,
+        "system_inquiry_ignored": 2,
+        "system_inquiry_auto_reply": 13
+      },
+      "rates": {
+        "transfer_rate": 3.45,
+        "quote_rate": 3.45,
+        "ai_fail_rate": 0.0,
+        "no_image_rate": 0.0
+      }
+    },
+    "policy_gate": {
+      "min_sample_count": 30,
+      "max_high_findings_rate": 0.08,
+      "max_ai_fail_rate": 5.0,
+      "max_transfer_rate": 45.0
+    },
+    "reasons": []
+  },
+  "proposals": [
+    {
+      "id": "policy-risk-transfer",
+      "priority": "p0",
+      "module": "policy/prompt",
+      "title": "风险关键词触发后强制转人工",
+      "suggestion": "在风险路由的系统提示词中增加硬规则：遇到退款/投诉/法律威胁类诉求必须调用 transfer_to_human。",
+      "evidence_count": 1
+    },
+    {
+      "id": "tone-empathy-pack",
+      "priority": "p1",
+      "module": "policy/prompt",
+      "title": "高风险场景补充安抚模板",
+      "suggestion": "为投诉类回复追加一段安抚模板，降低激化概率。",
+      "evidence_count": 1
+    },
+    {
+      "id": "ops-regression-gate",
+      "priority": "p0",
+      "module": "eval/pipeline",
+      "title": "上线前回归门禁",
+      "suggestion": "新增候选策略必须在离线评测集上通过，再灰度 5% 流量后扩大。",
+      "evidence_count": 132
+    }
+  ],
+  "status": "ready_for_gray_5_percent"
+}

config/evolution_policy.json

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+{
+  "publish_gate": {
+    "min_sample_count": 30,
+    "max_high_findings_rate": 0.08,
+    "max_ai_fail_rate": 5.0,
+    "max_transfer_rate": 45.0
+  },
+  "gray_release": {
+    "first_stage_percent": 5,
+    "second_stage_percent": 20,
+    "final_stage_percent": 100
+  }
+}
+