Refresh local build and test scripts, add DRM and Intel GPU test scripts

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

local/scripts/test-phase1-desktop-substrate.sh

@@ -111,6 +111,9 @@ run_guest_checks() {
         echo "  FAIL  /scheme/drm does not exist"
         failures=$((failures + 1))
     fi
+    if command -v redbear-drm-display-check >/dev/null 2>&1; then
+        echo "  NOTE  redbear-drm-display-check available (run manually for bounded display validation)"
+    fi
     echo
 
     echo "--- health check summary ---"