Add Windows frontend execution adapter

Author: mearvk

src/windows/WindowsFrontendAdapter.java

@@ -0,0 +1,23 @@
+package windows;
+
+import java.util.Objects;
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.CompletionStage;
+
+/**
+ * Windows-facing adapter for translating a received call into a controlled
+ * Windows execution request. Transport code remains separate from execution
+ * policy so HTTP, Telnet, named pipes, or other frontends can share it.
+ */
+public final class WindowsFrontendAdapter {
+    private final WindowsExecution execution;
+
+    public WindowsFrontendAdapter(WindowsExecution execution) {
+        this.execution = Objects.requireNonNull(execution, "execution");
+    }
+
+    public CompletionStage<WindowsExecution.Result> accept(WindowsCall call) {
+        Objects.requireNonNull(call, "call");
+        return CompletableFuture.supplyAsync(() -> execution.execute(call));
+    }
+}