test: the Steamify unit tests and the NVIDIA hardware test move here from steamify-cachyos (REPO points at the checkout)

.gitignore

@@ -8,6 +8,7 @@
 !/get-iso.sh
 !/TESTPLAN.md
 !/TODO.md
+!/tests
 !/nvidia/
 !/AGENTS.md
 !/.github/