fix: use UTF-8 for text file operations

s08_context_compact/code.py

@@ -89,7 +89,7 @@ def run_bash(command: str) -> str:
 
 def run_read(path: str, limit: int | None = None) -> str:
     try:
-        lines = (WORKDIR / path).resolve().read_text().splitlines()
+        lines = (WORKDIR / path).resolve().read_text(encoding="utf-8").splitlines()
         if limit and limit < len(lines):
             lines = lines[:limit] + [f"... ({len(lines) - limit} more lines)"]
         return "\n".join(lines)
@@ -101,7 +101,7 @@ def run_write(path: str, content: str) -> str:
     try:
         file_path = (WORKDIR / path).resolve()
         file_path.parent.mkdir(parents=True, exist_ok=True)
-        file_path.write_text(content)
+        file_path.write_text(content, encoding="utf-8")
         return f"Wrote {len(content)} bytes to {path}"
     except Exception as error:
         return f"Error: {error}"
@@ -110,10 +110,10 @@ def run_write(path: str, content: str) -> str:
 def run_edit(path: str, old_text: str, new_text: str) -> str:
     try:
         file_path = (WORKDIR / path).resolve()
-        text = file_path.read_text()
+        text = file_path.read_text(encoding="utf-8")
         if old_text not in text:
             return f"Error: text not found in {path}"
-        file_path.write_text(text.replace(old_text, new_text, 1))
+        file_path.write_text(text.replace(old_text, new_text, 1), encoding="utf-8")
         return f"Edited {path}"
     except Exception as error:
         return f"Error: {error}"
@@ -296,7 +296,7 @@ class ContextCompactor:
     def write_transcript(self, messages: list) -> Path:
         self.transcript_dir.mkdir(parents=True, exist_ok=True)
         path = self.transcript_dir / f"transcript_{uuid.uuid4().hex}.jsonl"
-        with path.open("x") as transcript:
+        with path.open("x", encoding="utf-8") as transcript:
             for message in messages:
                 transcript.write(json.dumps(message, default=str, ensure_ascii=False) + "\n")
         return path