| """The H3 backend: everything the rest of the timeline must not know. | |
| spec.py H3ModelSpec — STRUCTURAL facts. Relied on, never overridden. | |
| recipe.py H3RecipeProfile — EXPERIMENT-DERIVED values with provenance. | |
| Preferred, challengeable, versioned. | |
| gridlaw.py the single import point for motion.py's map machinery. | |
| compile.py H3Backend: plan -> legal .api.json. | |
| propose.py oracle profiles -> a ratio envelope. | |
| """ | |