Test precommit fix command - sed pattern escaping

Test that sed patterns with slashes are escaped properly
The sed command should handle URLs with forward slashes:
  $ echo "Line 1
  > Co-Authored-By: Claude
  > https://claude.ai/test
  > Generated with Claude
  > Line 2" | sed -e '/Co-Authored-By.*[Cc]laude/d' -e '/https:\/\/claude\.ai\//d' -e '/Generated with.*[Cc]laude/d'
  Line 1
  Line 2