docs: point links at renamed Ruby repo

[cardmagic]

The Ruby gem's GitHub repository moved from cardmagic/solid_objects to cardmagic/solid-objects-ruby. The gem name stays solid_objects. Update the README and the compatibility ledger so links skip the redirect.

[greptile-apps]

Greptile Summary

Updates documentation and compatibility metadata to use the Ruby project’s renamed GitHub repository.

• Repoints the README design-provenance link to cardmagic/solid-objects-ruby.
• Updates compatibility/ruby.yml to use the same canonical repository URL.

Confidence Score: 5/5

The PR appears safe to merge.

The two documentation-only URL updates are consistent, correctly formatted, and introduce no supported behavioral or contract failure.

Important Files Changed

Filename	Overview
README.md	Updates the Ruby implementation link consistently with the documented repository rename; no issue found.
compatibility/ruby.yml	Updates the Ruby repository metadata while preserving the existing YAML structure and gem naming; no issue found.

_{Reviews (1): Last reviewed commit: "docs: point links at renamed Ruby repo" | Re-trigger Greptile}