RU Universality Certificate Engine

Start here
- docs/Abstract.md
- docs/RU_Engine_Overview.md
- docs/Reading_Order.md

Run the self-check
- python tools/ci_selfcheck.py

Key interfaces
- sources/host_instance_schema.json
- sources/host_instances/
- sources/ru/robust_certificate_schema.json
- sources/ru/global_universality_report_schema.json

Index
- docs/Artifacts.md (generated by python tools/build_artifact_index.py)
