bugeffort-smallfilter-qualitygood first issue
Description
Sometimes an LLM wants to invert the search and will use the grep -v command. RTK doesn't support this because the -v argument controls verbosity
Steps to reproduce
rtk grep -v foo /etc/hosts
Expected result
rtk grep should return all lines in the file which do not contain the string "foo"
Actual result
rtk grep returns all lines which do contain the string "foo"