Add comprehensive GitHub Copilot instructions, merge main branch updates, and bump version to 4.0.2 - #30

Add comprehensive GitHub Copilot instructions, merge main branch updates, and bump version to 4.0.2#30

lukebrdn with Copilot wants to merge 10 commits into

maincheckdigit/hash:mainfrom

copilot/fix-29checkdigit/hash:copilot/fix-29Copy head branch name to clipboard