7 tasks: build.rs POC → parameterize #define → update launches → build all → replace runtime compilation → delete NVRTC infra → integration test. Key insight: convert #define STATE_DIM/NUM_ATOMS to kernel params so each kernel has ONE version regardless of model config. No multi-variant compilation. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>