Initialize standalone Frame Dictation scaffold and install preflight

src/main.cpp

@@ -0,0 +1,24 @@
+#include <iostream>
+#include <string_view>
+
+namespace {
+void help() {
+    std::cout << "Frame Dictation — standalone Steam Frame voice typing\n"
+                 "Scaffold only: overlay, microphone, ASR and input are not implemented.\n\n"
+                 "Usage: frame-dictation [--help | --version]\n"
+                 "No device access or background processes are started.\n";
+}
+}
+
+int main(int argc, char** argv) {
+    if (argc == 1 || (argc == 2 && std::string_view(argv[1]) == "--help")) {
+        help();
+        return 0;
+    }
+    if (argc == 2 && std::string_view(argv[1]) == "--version") {
+        std::cout << "frame-dictation " << FRAME_DICTATION_VERSION << " (scaffold)\n";
+        return 0;
+    }
+    std::cerr << "Unsupported arguments. Use --help; runtime features are not implemented.\n";
+    return 2;
+}