docs: nvidia/: TODO, research and test instructions for the NVIDIA fix (moved here from the steamify-cachyos branch); AGENTS.md: feature notes live in this repo

.gitignore

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