feat: implement kernel capability model

programs/src/network/main.cpp

@@ -951,7 +951,13 @@ static void render() {
 }
 
 static void launch_dhcp() {
-    int pid = montauk::spawn("0:/os/dhcp.elf");
+    montauk::abi::SpawnCapabilities caps{
+        montauk::abi::CAP_NETWORK_ADMIN,
+        montauk::abi::CAP_NETWORK_ADMIN,
+        0
+    };
+    int pid = montauk::spawn_with_caps("0:/os/dhcp.elf", nullptr,
+                                       nullptr, caps);
     if (pid >= 0) {
         set_status("DHCP client started");
     } else {