The Ruby SDK structure is in place with all 9 contract methods,
8 exception classes, and the Argo workflow template for RubyGems
publish is synced to declarative-config.
This is a v1.1+ deferred task. Ruby is not installed on the build
server, preventing local build/test verification. The SDK should
be moved to a separate repo (github.com/jedarden/pdftract-ruby)
when the v1.1+ release wave begins.
Verification note: notes/pdftract-45vo7.md
