Add 15 new tests in two classes:
- TestRmFalsePositiveFix (8 tests): verify filenames starting with 'r'
(readme.txt, requirements.txt, report.csv, etc.) are NOT falsely
flagged as 'recursive delete'
- TestRmRecursiveFlagVariants (7 tests): verify all recursive delete
flag styles (-r, -rf, -rfv, -fr, -irf, --recursive, sudo rm -rf)
are still correctly caught
All 29 tests pass (14 existing + 15 new).