test(rt): read the TLAS from the descriptor heap, with a probe for the NVIDIA fault

HeapASRead renders a triangle, tracing half the frame with traceRayEXT
and ray querying the other half, both reading the TLAS out of the
descriptor heap, and checks the read-back pixels. The test runner runs
it through the engine's normal path, so on NVIDIA it covers the rewrite
too: an inherited CRAFTER_GRAPHICS_NO_AS_WORKAROUND is cleared, and the
test checks the rewrite is on exactly where the driver needs it.

HeapASRead --no-workaround is the check for a newer driver. Each path
renders in its own child process with the rewrite off and validation
off (GPU-assisted validation instruments the shaders), so a device loss
on one doesn't hide the other. On 615.78.08 traceRayEXT still loses the
device and the ray query renders nothing.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/HeapASRead/heapas-miss.glsl

@@ -0,0 +1,11 @@
+//SPDX-License-Identifier: LGPL-3.0-only
+//SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®
+
+#version 460
+#extension GL_EXT_ray_tracing : enable
+
+layout(location = 0) rayPayloadInEXT vec3 hitValue;
+
+void main() {
+    hitValue = vec3(0.5);
+}