The File: EF.DIR [LF] line doubled as the selection store: pysimFsClickFile
wrote a formatted display string there and pysimFsRead/Save parsed it back
(stripping '✗ ' and ' [TYPE]'). The pane now keeps the name in
pysimFsSelected, the redundant title is gone (FID/type/size/FCI remain in
the info block), and the dead pysimFsSelect() plus the unused 'File:' RU
entry are removed. Read/Save still re-select on the server first: pySim's
current selection is a shared cursor that tree expansion, scans and
commands move, so it cannot identify the file shown in the pane.
SW cache v121 -> v122; structural test updated.