Add Getting Started sections and correct usage commands to all category
READMEs (TypeScript, Python, Bash). Update top-level README.md and
CLAUDE.md to reflect the Bash language, correct project structure, and
accurate make run instructions. Remove completed DOCS_TODO.md.
Move yubikey scripts from bash/ root into bash/yubikey/, move cohort shell
scripts from python/cohort/ into bash/cohort/, and update run.sh to support
Bash as a third language with category-based script discovery.
hikari