Answer architecture round 6: a manifest's reads names namespaces, loadReached notes only those nothing loaded provides, a mounted module labels its files by its namespace, Source.Load checks its mount, and the README keeps namespace and reads in an edited copy

CHANGELOG.md

@@ -131,9 +131,9 @@ replacement, and each removed path, column or flag.
   and the CLI carries them all. `New` loads the modules `WithDataFS(modules...)` names and
   the folders `WithDataPath` names, and fails, naming `WithDataFS`, where no such option
   is given. A manifest's `namespace` mounts its source under a dot path, and its `reads` lists the
-  modules its source reads by default; a reference to a path nothing provides fails to
-  load, asking whether a module is missing and naming every module the loaded manifests
-  read, or saying there are none.
+  namespaces of the modules its source reads by default; a reference to a path nothing
+  provides fails to load, asking whether a module is missing and naming each namespace
+  read that nothing loaded provides, or saying no loaded manifest names a module to add.
 - A data source whose root holds a `.fejkdata.json` manifest with an `index` loads each
   category on the first call reaching it, as each shipped module does. Data failing to load,
   in `New` or on that first call, gives an error matching `ErrLoad`, and the CLI exits 1.