chore: standardize BUSL licensing metadata

[kayodebristol]

Summary

• declare BUSL-1.1 as the single project and package license
• remove the contradictory MIT dual-license claims from public surfaces
• add a regression check to keep license metadata aligned

Validation

• python -m ruff check tests\\test_licensing_metadata.py
• python -m pytest -o addopts="" tests\\test_licensing_metadata.py -q
• python -m build --no-isolation --outdir <temp>
  • built wheel metadata declares License-Expression: BUSL-1.1 and License-File: LICENSE; the sdist includes LICENSE

[Copilot]

Pull request overview

Standardizes project licensing metadata on BUSL-1.1 and adds regression coverage.

Changes:

• Removes MIT dual-license notices.
• Updates package and README licensing metadata.
• Adds a licensing consistency test.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
LICENSE	Removes dual-license notices.
README.md	Documents BUSL-1.1 licensing.
pyproject.toml	Declares BUSL-1.1 package metadata.
tests/test_licensing_metadata.py	Adds metadata regression checks.

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