# axiolid-surface implementation plan
Status: architecture scaffold; algorithms incomplete. This is planning context,
not standing agent instruction.
## Established
- Crate boundary and dependency direction are executable in the layering gate.
- Public data/contracts compile. Behavior remains scaffold unless a test names it.
## Next implementation wave
Implement validated constructors and scalar evaluators.
## Exit evidence
Targeted tests, feature-isolated compile where applicable, mutation-verified
architecture/validation gates, and benchmarks before performance claims.