test: Add thinking trace parsing tests

src/models.py

@@ -132,7 +132,18 @@ def parse_history_entries(history_strings: list[str], roles: list[str]) -> list[
  return entries
 
 @dataclass
-@dataclass
+class ThinkingSegment:
+ content: str
+ marker: str # 'thinking', 'thought', or 'Thinking:'
+
+ def to_dict(self) -> Dict[str, Any]:
+  return {"content": self.content, "marker": self.marker}
+
+ @classmethod
+ def from_dict(cls, data: Dict[str, Any]) -> "ThinkingSegment":
+  return cls(content=data["content"], marker=data["marker"])
+
+
 @dataclass
 class Ticket:
  id: str
@@ -239,8 +250,6 @@ class Track:
   )
 
 
-@dataclass
-@dataclass
 @dataclass
 class WorkerContext:
  ticket_id: str