- App.Rc runs all executable files in <castle>/.homesick.d in sorted
(lexicographic) order with the castle root as cwd
- Non-executable files are skipped
- stdout/stderr from scripts forward to App writers
- If .homesickrc exists and parity.rb does not yet exist in .homesick.d,
a Ruby wrapper (parity.rb) is generated before execution
- Existing parity.rb is never overwritten
- Wire rcCmd in CLI with optional CASTLE argument (defaults to dotfiles)
