Add macOS LLM model engine support and environment setup

swift/build.sh

@@ -13,14 +13,23 @@ swiftc -O -parse-as-library SpeechHelper.swift -o speech-helper
 echo "built $HERE/speech-helper"
 
 if ./speech-helper --check >/dev/null 2>&1; then
-    echo "it runs — ./speech-helper --check for details"
+    echo "speech-helper runs — ./speech-helper --check for details"
 else
     status=$?
     if [ "$status" -eq 137 ]; then
-        echo "built, but killed on launch (137): request binary approval for"
+        echo "built speech-helper, but killed on launch (137): request binary approval for"
         echo "  $HERE/speech-helper"
-        echo "then wait a few minutes for it to sync."
     else
-        echo "built, but exited $status — run ./speech-helper --check to see why"
+        echo "built speech-helper, but exited $status — run ./speech-helper --check to see why"
     fi
 fi
+
+if swiftc -O LLMHelper.swift -o llm-helper 2>/dev/null; then
+    echo "built $HERE/llm-helper"
+    if ./llm-helper --check >/dev/null 2>&1; then
+        echo "llm-helper runs — ./llm-helper --check for details"
+    fi
+else
+    echo "could not build llm-helper with FoundationModels; fallback to Python MLX/PyObjC bridge will be available"
+fi
+