Previous commit 6d89728 had a misleading message - the rename
itself never landed (Edit-without-Read failure cascaded silently
in the parent shell). 6d89728 incidentally captured 810 lines of
in-flight work from concurrent runtime agents and shipped it under
the wrong message; the in-flight agents will land their final
verified state on top.
This commit is just the actual rename: str_format(template, data)
to str_format(fmt, data). C++ keyword conflict resolved.
Will Anderson
2e9d3247a6