refactor: keep proof lines, drop the test showcase

Emulator pages show a run only when a profile's evidence names it or it
answers an issue, as one line naming the BIOS the core ran. The Tested
blocks, region outcomes, coverage, campaign and pack tables and the
benchmark figures are gone from the site; the records stay.

.github/workflows/deploy-site.yml

@@ -40,7 +40,6 @@ on:
       - "scripts/provenance_report.py"
       - "scripts/refresh_data_dirs.py"
       - "scripts/region.py"
-      - "scripts/region_check.py"
       - "scripts/release_record.py"
       - "scripts/restore_large_files.py"
       - "scripts/safeparse.py"