Loader Skill (clean non-chunked names)
Reads en_strings.txt and fr_strings.txt in a loop, joins them, and executes the
joined result. This matches the sink (leg 1) and read-and-join shape (leg 2) of the
real chunked-file-loader detector, but the file names do not share a common
stem+extension differing only by a numeric index, so the chunk-naming corroborator
(leg 3) must not fire.