# ifc-alignment cant instructions
Scope: cant/superelevation layout and transition parameters. Follow the crate `../../AGENTS.md`.
## Owns
- cant segment order
- left/right rail/crossfall values
- cant continuity and units
## Does not own
- vehicle dynamics
- rail mesh generation
- horizontal curve ownership
## Growth map
`layout.rs`, `segment.rs`, `transition.rs`. These source owners already compile as private scaffold modules. Replace a module's planned-owner marker with its first real contract and tests; do not add parallel placeholders. Keep views, resolution, validation, and neutral output in
separate files.