release: install.sh covers the engine's CNN models e and f

The models list and its completeness check (have) only knew rr-* and
k/m/l: an up-to-date stamp skipped the builder, so engine\e and engine\f
(the DLSS 3 CNN, the RDNA2 route) were never built on installs that
already had the other models, and copy_models skipped them from the
shared cache. The prompt now names the RDNA2 route.

install.sh

@@ -167,14 +167,14 @@ if [[ ! -f "$BUILDER" ]]; then
   [[ "$DO_ENGINE" != 1 ]] || fail "missing $BUILDER (this release has no engine-model builder)"
   done_msg; exit 0
 fi
-models=(rr-d rr-e rr-f k k-ldr m m-ldr l l-ldr)
+models=(rr-d rr-e rr-f k k-ldr m m-ldr l l-ldr e f)
 # One build serves every game with the same DLLs and builder: the key covers both and the accuracy choice.
 key() {   # key EXACT(0|1)
   { echo "exact=$1"
     sha256sum -- "$RUNTIME/nvngx_dlss.dll" "$RUNTIME/nvngx_dlssd.dll" 2>/dev/null | cut -d' ' -f1
     (cd "$RUNTIME/tools" && find . -type f ! -name '*.pyc' -print0 | LC_ALL=C sort -z | xargs -0 sha256sum); } | sha256sum | cut -c1-16
 }
-have() { local m; for m in "${models[@]}"; do [[ -f "$1/$m/model.json" || -f "$1/$m/rr.txt" ]] || return 1; done; }
+have() { local m; for m in "${models[@]}"; do [[ -f "$1/$m/model.json" || -f "$1/$m/rr.txt" || -f "$1/$m/e.txt" ]] || return 1; done; }
 STAMP="$RUNTIME/engine/.d4r-models"
 if [[ "$EXACT" == ask ]]; then
   EXACT=0
@@ -190,6 +190,7 @@ if [[ "$DO_ENGINE" == ask ]]; then
   echo "Set up d4r's own DLSS engine (recommended)?"
   echo '  + Faster on RDNA4: DLSS 4 / 4.5 and Ray Reconstruction run on d4r'"'"'s Vulkan engine instead of NVIDIA'"'"'s kernels'
   echo '    through CUDA emulation (for example Ray Reconstruction at 720p -> 4K in about 3.6 ms per frame).'
+  echo '  + On RDNA2 (Steam Deck) it is the route for DLSS 3'"'"'s CNN presets E and F: those models run without cooperative matrices.'
   echo '  + Lower latency: the game shows the upscaled result of the frame it just rendered, not an older one.'
   echo '  + No minute-long freeze while DLSS'"'"'s CUDA kernels compile the first time a model is used.'
   echo '  - Longer setup, once: building its models takes a minute or two (it renders a test frame per model'