fix: auto compaction threshold default 200k tokens

src/transcript.py

@@ -0,0 +1,23 @@
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+
+
+@dataclass
+class TranscriptStore:
+    entries: list[str] = field(default_factory=list)
+    flushed: bool = False
+
+    def append(self, entry: str) -> None:
+        self.entries.append(entry)
+        self.flushed = False
+
+    def compact(self, keep_last: int = 10) -> None:
+        if len(self.entries) > keep_last:
+            self.entries[:] = self.entries[-keep_last:]
+
+    def replay(self) -> tuple[str, ...]:
+        return tuple(self.entries)
+
+    def flush(self) -> None:
+        self.flushed = True