test: fix structured reask evidence and live coverage conclusions

tests/live_evidence.py

@@ -225,11 +225,12 @@ _SAFE_FIELDS = frozenset(
         "error_type",
         "error_status",
         "evidence_notes",
+        "subruns",
     }
 )
 _ATTEMPT_FIELDS = frozenset({"call_id", "error_type", "http"})
 _HTTP_FIELDS = frozenset(
-    {"status_code", "request_checks", "identity_captured", "error_body_complete"}
+    {"status_code", "request_checks", "identity_captured", "error_body_complete", "machine_type"}
 )
 
 
@@ -243,6 +244,8 @@ def _validate_safe(fields: Mapping[str, Any]) -> None:
         for event in attempt["http"]:
             if not isinstance(event, dict) or set(event) != _HTTP_FIELDS:
                 raise ValueError("非法 HTTP 报告")
+            if event["machine_type"] not in ("model_not_found", "omitted"):
+                raise ValueError("报告机器字段不是认可枚举")
             if not isinstance(event["request_checks"], dict) or any(
                 type(v) is not bool for v in event["request_checks"].values()
             ):
@@ -273,7 +276,7 @@ def write_live_round(
 
 
 def safe_attempts(attempts: Sequence[AttemptEvidence]) -> list[dict[str, Any]]:
-    """只导出事实布尔值、异常类和状态；不落盘任何上游正文。"""
+    """只导出事实、异常类与认可机器枚举；任意上游字符串一律省略。"""
     return [
         {
             "call_id": attempt.call_id,
@@ -284,6 +287,11 @@ def safe_attempts(attempts: Sequence[AttemptEvidence]) -> list[dict[str, Any]]:
                     "request_checks": dict(event.request_checks),
                     "identity_captured": event.raw_identity[0],
                     "error_body_complete": event.error_body is not None,
+                    "machine_type": (
+                        "model_not_found"
+                        if error_machine_type(event) == "model_not_found"
+                        else "omitted"
+                    ),
                 }
                 for event in attempt.http
             ],