unstructured

7c5855bd - Replace lazyproperty with functools.cached_property (#4282)

Replace lazyproperty with functools.cached_property (#4282) ## Summary - Replace custom `lazyproperty` descriptor with stdlib `functools.cached_property` - Fix bug where 26 properties returning `None` were re-evaluated on every access instead of caching — `lazyproperty.__get__` uses `if value is None` to detect a cache miss, so any property that legitimately returns `None` re-runs on every access - Slight performance improvement on cached reads — `cached_property` is a non-data descriptor, so after first access the `__dict__` entry shadows the descriptor directly (plain dict lookup vs `__get__` call) - Nothing in the codebase ever assigns to a lazyproperty-decorated attribute, so dropping the write-protection from the data descriptor has no behavioral impact