feat: Python porting workspace with reference data and parity audit

src/history.py

@@ -0,0 +1,22 @@
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+
+
+@dataclass(frozen=True)
+class HistoryEvent:
+    title: str
+    detail: str
+
+
+@dataclass
+class HistoryLog:
+    events: list[HistoryEvent] = field(default_factory=list)
+
+    def add(self, title: str, detail: str) -> None:
+        self.events.append(HistoryEvent(title=title, detail=detail))
+
+    def as_markdown(self) -> str:
+        lines = ['# Session History', '']
+        lines.extend(f'- {event.title}: {event.detail}' for event in self.events)
+        return '\n'.join(lines)