joungmin 128fde3ad6 fix: Python 3.9 compatibility for union type hints ...

Use Optional[T] + from __future__ import annotations instead of T | None
syntax which requires Python 3.10+.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-02-28 09:59:40 +09:00

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