Add support for spawning peers, and monitoring the processes

lib/agent.ex

@@ -56,9 +56,8 @@ defmodule Frajtano.Agent do
   end
 
   @impl true
-  def handle_call({:add_peer, path}, _from, state) do
-    # TODO: deduplicate peers by socket path
-    case Peer.start(path) do
+  def handle_call({:add_peer, spec}, _from, state) do
+    case Peer.start(spec) do
       {:ok, _} -> {:reply, :ok, state}
       {:error, error} -> {:reply, {:error, error}, state}
     end
@@ -73,7 +72,11 @@ defmodule Frajtano.Agent do
     GenServer.call(__MODULE__, {:sign, request}, :infinity)
   end
 
-  def add_peer(path) do
-    GenServer.call(__MODULE__, {:add_peer, path})
+  def assimilate(path) do
+    GenServer.call(__MODULE__, {:add_peer, {:socket, path}})
+  end
+
+  def spawn_peer(spec) do
+    GenServer.call(__MODULE__, {:add_peer, {:spawn, spec}}) 
   end
 end