Fix conflicting license declarations - Apache-2.0 vs BSD

## Problem

The repository has conflicting license declarations:

| Location | License |
|----------|---------|
| `LICENSE` file | Apache-2.0 |
| `pyproject.toml` classifier | BSD License |

## Recommendation

Make the license consistent. Either:

**Option A**: Keep Apache-2.0
- Update classifier to `"License :: OSI Approved :: Apache Software License"`

**Option B**: Switch to BSD
- Replace `LICENSE` file with BSD license text

Read the LICENSE file and the license classifier in pyproject.toml. Confirm which license the project intends to use, then make the declaration consistent in the named location or locations and verify that no conflicting license text or metadata remains.

Written by the indexing model from the issue text.