Clarify HCXClient singleton pattern - no changes needed

[Copilot]

Addressed review feedback on PR #27 regarding HCXClient instantiation efficiency. The concern was that creating a new HCXClient() instance on every call might be inefficient.

Resolution

No code changes required. HCXClient already implements the singleton pattern via __new__:

class HCXClient:
    """HCX API 공용 클라이언트 (싱글톤)"""
    
    _instance = None
    
    def __new__(cls, *args, **kwargs):
        if not cls._instance:
            cls._instance = super().__new__(cls)
            # ... initialization
        return cls._instance

Calling HCXClient() in description_generator.py always returns the same instance, making the current implementation efficient.

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