The fixed single-recipe world structures (conveyors, e.g. 1 Raw Aurogen
Crystal -> 10 Energy Rods) are a separate mechanic from workbench recipes.
Document where they live and how to read them, with a reproducible extractor.
- docs/PRODUCTION_LINES.md: the 'where to find it' record — ECS classes
(ProductionLineRecipeComponent -> CraftingRecipe), the epb_assets_all
game_conveyor_*_epb prefabs, EntityBlueprint/Odin serialization, the
extraction path, and the open energy_grid_*/island-placement lead.
- bundle/extract_production_lines.py: UnityPy + odin_read extractor ->
extracted/production_lines.json (14 conveyor recipes).
- BUNDLES.md: add production_lines.json to the data-source map.
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