Support decimals in crash reporting (#1473)

src/agent0/hyperlogs/json_encoder.py

@@ -3,6 +3,7 @@
 import json
 from dataclasses import asdict, is_dataclass
 from datetime import datetime
+from decimal import Decimal
 from enum import Enum
 from traceback import format_tb
 from types import TracebackType
@@ -48,6 +49,8 @@ def default(self, o: Any) -> Any:
             return o.tolist()
         if isinstance(o, FixedPoint):
             return str(o)
+        if isinstance(o, Decimal):
+            return str(o)
         if isinstance(o, Generator):
             return "NumpyGenerator"
         if isinstance(o, datetime):