fix: use UTF-8 for text file operations

agents/s05_skill_loading.py

@@ -66,7 +66,7 @@ class SkillLoader:
         if not self.skills_dir.exists():
             return
         for f in sorted(self.skills_dir.rglob("SKILL.md")):
-            text = f.read_text()
+            text = f.read_text(encoding="utf-8")
             meta, body = self._parse_frontmatter(text)
             name = meta.get("name", f.parent.name)
             self.skills[name] = {"meta": meta, "body": body, "path": str(f)}
@@ -135,7 +135,7 @@ 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]
@@ -146,7 +146,7 @@ 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}"
@@ -154,10 +154,10 @@ 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)
-        content = fp.read_text()
+        content = fp.read_text(encoding="utf-8")
         if old_text not in content:
             return f"Error: Text not found in {path}"
-        fp.write_text(content.replace(old_text, new_text, 1))
+        fp.write_text(content.replace(old_text, new_text, 1), encoding="utf-8")
         return f"Edited {path}"
     except Exception as e:
         return f"Error: {e}"