chore: add full MIT text, name the copyright holder properly
LICENSE held only the two-line stub and no LICENSE.md existed, so the repo carried no license text for a human browsing it or for GitHub's license detector. usethis::use_mit_license() writes LICENSE.md but leaves an existing LICENSE alone, so the stub kept saying 'Civilytics' while the full text said 'Civilytics Consulting LLC'. Corrected by hand, with a test pinning the two together.
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