SDK v0.2.0
Adds the reusable deterministic grid engine under @yugao-gaos/turn-based-grid-sdk/engine:
- simultaneous movement and deterministic random primitives
- reusable star scoring and budget-failure behavior
- reducer-injected shortest-path solver
- deterministic transcript replay verification
- documented SDK/product ownership boundary
Zonoid characters, abilities, campaign types, authored levels, and server policy remain in the platform repository.