--season auto-numbers episodes (E01, E02, ...) across a directory;
--set TYPE=VALUE overrides any parsed chunk, e.g. forcing name when
release text buries it in noise. Requires splitting SxxExx tokens
into separate season/episode chunks (previously one glued value)
and rejoining them without a separator in the generated name.
Also scopes --season numbering per directory instead of the whole
tree, drops leftover unknown text when overriding name on titles
with nothing else recognized, and makes extension matching
case-insensitive.
