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diff --git a/data/structures.lua b/data/structures.lua
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+-- Base scenario structures. Empty by default; mods under data/mods/ append to
+-- the global `Structures` list. Each structure is:
+--   { name = "...", beams = { {x1,y1,x2,y2,material}, ... } }
+-- The loader creates/merges nodes at the endpoints and welds the beams.
+Structures = Structures or {}