Answer architecture round 5: the shipped packages are enus, svse, geose, geous and misc, each holding its files at its root under its manifest's namespace, and the errors use the wording a bench of the Audience chose

data/enus/fs.go

@@ -0,0 +1,9 @@
+// Package enus is fejkdata's en_US locale module, whose categories are en_US.*. Its address reads geous's places.
+package enus
+
+import "embed"
+
+// FS holds the module's categories and its manifest; pass it to fejkdata.WithDataFS.
+//
+//go:embed *.json *.tsv .fejkdata.json
+var FS embed.FS