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/misc/.fejkdata.json

@@ -20,5 +20,6 @@
 		"misc.tld": {"paths":["","tld","type","unicode"]},
 		"misc.useragent": {"paths":["","browser","device","os","ua"]},
 		"misc.uuid": {"paths":["","variant"]}
-	}
+	},
+	"namespace": "misc"
 }

data/misc/fs.go

@@ -1,9 +1,9 @@
-// Package misc is fejkdata's misc module.
+// Package misc is fejkdata's locale-neutral module, whose categories are misc.*.
 package misc
 
 import "embed"
 
-// FS holds the misc categories and the module's manifest; pass it to fejkdata.WithDataFS.
+// FS holds the module's categories and its manifest; pass it to fejkdata.WithDataFS.
 //
-//go:embed misc .fejkdata.json
+//go:embed *.json *.tsv .fejkdata.json
 var FS embed.FS