+csv-get wraps get_range_as_csv, which has no value_render_option support
(absent from its input type, executor, and published tool schema — it always
returns formatted display text via getText()). The CLI passed the flag through
as a silent no-op: callers asking for raw_value/formula got formatted values.
Remove the flag from flag-defs, drop the value_render_option passthrough in
csvGetInput, and clean the stale SKILL references. The real value_render_option
capability is unchanged on +cells-get (get_cell_ranges) via --include formula.