feat: start on AI integration

lib/bds/ai/in_flight.ex

@@ -0,0 +1,29 @@
+defmodule BDS.AI.InFlight do
+  @moduledoc false
+
+  @table :bds_ai_in_flight
+
+  def register(conversation_id, pid) when is_binary(conversation_id) and is_pid(pid) do
+    :ets.insert(table(), {conversation_id, pid})
+    :ok
+  end
+
+  def unregister(conversation_id) when is_binary(conversation_id) do
+    :ets.delete(table(), conversation_id)
+    :ok
+  end
+
+  def lookup(conversation_id) when is_binary(conversation_id) do
+    case :ets.lookup(table(), conversation_id) do
+      [{^conversation_id, pid}] -> pid
+      _other -> nil
+    end
+  end
+
+  defp table do
+    case :ets.whereis(@table) do
+      :undefined -> :ets.new(@table, [:named_table, :public, :set, read_concurrency: true])
+      table -> table
+    end
+  end
+end