fix(stubgen): reconfigure stdout only when it supports it

Callers that replace sys.stdout (test_stubgen redirect_stdout) have no reconfigure().

Co-Authored-By: Claude <noreply@anthropic.com>

tools/stubgen.py

@@ -211,7 +211,8 @@ def main(argv=None):
     ap.add_argument("--td-out", required=False, default=None, help="output file for TechnicalDebt lines, which go in docs/dev/debt/MODULE.md, default stderr when code uses stdout, otherwise stdout")
     ap.add_argument("--td-only", action="store_true", help="print only TechnicalDebt lines, no code")
     args = ap.parse_args(argv)
-    sys.stdout.reconfigure(encoding="utf-8", newline="\n")
+    if hasattr(sys.stdout, "reconfigure"):
+        sys.stdout.reconfigure(encoding="utf-8", newline="\n")
     try:
         if not args.td_only and args.out and args.td_out and same_file(args.out, args.td_out):
             ap.error("--out and --td-out must name different files")