Document source-root configuration controls

docs/consumers/README.md

@@ -7,6 +7,16 @@ Your application still owns CLI parsing, resource reads, remote acquisition, and
 runtime initialization.
 
 Import `"go.maximumdirect.net/configkit"`; the package name is `configkit`.
+
+Document controls now use root `config` in every source. Rename genuine old
+`configkit` or `_configkit` control blocks and update stored declaration paths
+from `/configkit/...` to `/config/...`. Old blocks become ordinary data and a
+permissive schema can accept them without executing imports. Move, rename, or
+separately mount application fields previously authored as source-root `config`.
+Nested and assembled root `config` values remain ordinary application data; the
+[mounted-root example](../../examples/consumers/config_controls_test.go) shows
+the boundary. See the [configuration contract](../config.md#declaration-and-selection-rules)
+for the complete rules.
 Start with one file, then choose the tasks your application needs:
 
 | Task | Start here |