docs: add MIT license file

[lan17]

Summary

• Add a root LICENSE file using the MIT license already declared in pyproject.toml.

Validation

• git diff --cached --check

Notes

• This is documentation/legal metadata only; no runtime code changes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.47%. Comparing base (683034b) to head (0af9704).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #138   +/-   ##
=======================================
  Coverage   97.47%   97.47%           
=======================================
  Files          13       13           
  Lines         673      673           
=======================================
  Hits          656      656           
  Misses         17       17           

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