fix: use UTF-8 for text file operations

agents/s07_task_system.py

@@ -58,11 +58,11 @@ class TaskManager:
         path = self.dir / f"task_{task_id}.json"
         if not path.exists():
             raise ValueError(f"Task {task_id} not found")
-        return json.loads(path.read_text())
+        return json.loads(path.read_text(encoding="utf-8"))
 
     def _save(self, task: dict):
         path = self.dir / f"task_{task['id']}.json"
-        path.write_text(json.dumps(task, indent=2, ensure_ascii=False))
+        path.write_text(json.dumps(task, indent=2, ensure_ascii=False), encoding="utf-8")
 
     def create(self, subject: str, description: str = "") -> str:
         task = {
@@ -95,7 +95,7 @@ class TaskManager:
     def _clear_dependency(self, completed_id: int):
         """Remove completed_id from all other tasks' blockedBy lists."""
         for f in self.dir.glob("task_*.json"):
-            task = json.loads(f.read_text())
+            task = json.loads(f.read_text(encoding="utf-8"))
             if completed_id in task.get("blockedBy", []):
                 task["blockedBy"].remove(completed_id)
                 self._save(task)
@@ -107,7 +107,7 @@ class TaskManager:
             key=lambda f: int(f.stem.split("_")[1])
         )
         for f in files:
-            tasks.append(json.loads(f.read_text()))
+            tasks.append(json.loads(f.read_text(encoding="utf-8")))
         if not tasks:
             return "No tasks."
         lines = []
@@ -142,7 +142,7 @@ def run_bash(command: str) -> str:
 
 def run_read(path: str, limit: int = None) -> str:
     try:
-        lines = safe_path(path).read_text().splitlines()
+        lines = safe_path(path).read_text(encoding="utf-8").splitlines()
         if limit and limit < len(lines):
             lines = lines[:limit] + [f"... ({len(lines) - limit} more)"]
         return "\n".join(lines)[:50000]
@@ -153,7 +153,7 @@ def run_write(path: str, content: str) -> str:
     try:
         fp = safe_path(path)
         fp.parent.mkdir(parents=True, exist_ok=True)
-        fp.write_text(content)
+        fp.write_text(content, encoding="utf-8")
         return f"Wrote {len(content)} bytes"
     except Exception as e:
         return f"Error: {e}"
@@ -161,10 +161,10 @@ def run_write(path: str, content: str) -> str:
 def run_edit(path: str, old_text: str, new_text: str) -> str:
     try:
         fp = safe_path(path)
-        c = fp.read_text()
+        c = fp.read_text(encoding="utf-8")
         if old_text not in c:
             return f"Error: Text not found in {path}"
-        fp.write_text(c.replace(old_text, new_text, 1))
+        fp.write_text(c.replace(old_text, new_text, 1), encoding="utf-8")
         return f"Edited {path}"
     except Exception as e:
         return f"Error: {e}"