CodeSenpai4ever

#!/usr/bin/env bash
#
# csv_to_pki_json.sh
#
# Pure POSIX shell + awk implementation (NO python, NO jq, NO extra
# installs) - works in plain Git Bash / MINGW / any minimal shell that
# ships awk, sed, grep (i.e. basically everywhere).
#
# IMPORTANT: True .xlsx files are zip archives containing XML - a shell
# without unzip/python literally cannot decode that binary format. So