fix(tools): make run-gui-with-fake.sh refuse a Lite build dir

A Lite-configured tree builds ObsidianDragonLite and has no embedded
daemon, so any bin/ObsidianDragon left in it is a stale full-node binary
that the harness would otherwise run silently. Point --build-dir at a
full-node tree instead.

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

tools/fake_dragonxd/run-gui-with-fake.sh

@@ -27,6 +27,11 @@ done
 
 gui="$build_dir/bin/ObsidianDragon"
 stub="$build_dir/fake_dragonxd/dragonxd"
+# A Lite tree has no embedded daemon and builds ObsidianDragonLite; any bin/ObsidianDragon in it is stale.
+if grep -q '^DRAGONX_BUILD_LITE:BOOL=ON' "$build_dir/CMakeCache.txt" 2>/dev/null; then
+    echo "$build_dir is configured as the Lite variant; pass --build-dir of a full-node tree" >&2
+    exit 1
+fi
 if [[ ! -x "$gui" ]]; then
     echo "missing $gui; build the app first (./build.sh)" >&2
     exit 1