fix: code_run encoding compat; wechat truncate long code blocks & limit msg count

assets/code_run_header.py

@@ -8,6 +8,9 @@ def _d(b):
     except: return b.decode('gbk', 'replace')
 def _run(*a, **k):
     t = k.pop('text', 0) | k.pop('universal_newlines', 0)
+    enc = k.pop('encoding', None)
+    k.pop('errors', None)
+    if enc: t = 1
     if t and isinstance(k.get('input'), str):
         k['input'] = k['input'].encode()
     r = _r(*a, **k)