Behaviour for TEA apps that expose model state as MCP resources.

Apps implement mcp_resources/0 to declare named projections of their model. Each projection becomes a browsable MCP resource at raxol://session/{id}/model/{key}.

Example

defmodule MyApp do
  use Raxol.UI, framework: :react
  @behaviour Raxol.MCP.ResourceProvider

  @impl Raxol.MCP.ResourceProvider
  def mcp_resources do
    [
      {"counters", &Map.get(&1, :counters, %{})},
      {"status", fn model -> %{state: model.state, uptime: model.uptime} end}
    ]
  end

  # ... init/1, update/2, view/1
end

The ToolSynchronizer checks for this callback at init and registers resources accordingly, updating them on each model change.