fix: Apply black formatting and add Legacy Code Mapper to README#54

BruinGrowly merged 1 commit intomainBruinGrowly/Python-Code-Harmonizer:mainfrom

claude/fix-ci-and-readme-011CUpBZStBR8iC59eVzkbqkBruinGrowly/Python-Code-Harmonizer:claude/fix-ci-and-readme-011CUpBZStBR8iC59eVzkbqkCopy head branch name to clipboard