@callback start(config :: map()) :: {:ok, map()} | {:error, String.t()}

Called when a plugin is starting up after initialization.

This is called after the plugin has been initialized and loaded, but before it becomes fully active. The plugin can perform any startup tasks here, such as setting up connections, starting background processes, or registering event handlers.

Returns {:ok, updated_config} or {:error, reason}.

@callback stop(config :: map()) :: {:ok, map()} | {:error, String.t()}

Called when a plugin is stopping before unloading.

This is called before the plugin is unloaded, allowing it to perform cleanup tasks such as closing connections, stopping background processes, or unregistering event handlers.

Returns {:ok, updated_config} or {:error, reason}.