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ef4e99a582
On a million-instance scenery (tomaszewo) the infra pass was spending ~24s reopening pure-visual leaf twins (grass.incb etc.) just to skip their content -- ~200k cParser constructions, because every flora include reopens the same leaf. Twin header now flags whether a file has any infrastructure node or include (format bumped to v10). A pure-visual leaf (flora .incb: triangles + transform directives only) has it clear, so the infra pass skips opening it: the first open of each file caches the verdict, later opens are dropped before construction. Result on tomaszewo: infra 55s -> 31s, getToken 1.06M -> 89k. Also adds a load profiler (per-type build time, dispatch time, getToken count) behind WriteLog so the next bottleneck is measured, not guessed (it's now the 25s of decorative vehicle media loading).