v1.6.2

# What's New in v1.6.2

This is a minor maintenance release focused on safer word embedding loading and internal code quality.

## Highlights

* **Safer Word Embeddings** – word embedding models now ship in NumPy's `.npz` format and load with pickling disabled, removing arbitrary code execution risk at load time. Existing `.bin` models continue to load through a restricted unpickler.
* **Clearer Error Types** – passing an unsupported input type to a transform, pipeline, or word cloud now raises `TypeError` instead of `ValueError`.
* **Code Quality** – upgraded the development toolchain and cleaned up the issues it surfaced across the codebase.