test(compliance): wire Ruby into the compliance matrix; report n/a honestly

suite.ts registers the ruby binding's report path. report.ts previously
iterated the report files present on disk; it now iterates the declared
bindings, which surfaces a latent presentation bug: a language whose
report file is absent in a given checkout would render as a false 0.00%.
Absent reports now render as "n/a" cells with an (n/a) header — languages
with report files are computed exactly as before, and the regenerated
gh-pages report reflects both changes.

Author: omarqureshi