phase3: FIX arg-bang regex (missing \] in char class skipped subscripts). 235->183

tools/nullfix.py

@@ -132,7 +132,7 @@ def insert_arg_bang(line, col0):
     if not val: return None
     if val[0] in '0123456789"\'': return None      # 字面量跳过
     if val in ('true','false','null'): return None
-    if not re.fullmatch(r'[\w.\[\()!]+', val): return None  # 含运算符/空格跳过
+    if not re.fullmatch(r'[\w.\[\]()!]+', val): return None  # 含运算符/空格跳过
     return line[:j+1]+'!'+line[j+1:]
 
 def make_field_nullable(lines, name):