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RE-26 follow-up: 80 columns with cut bodies — recover what cuts them, not the section #239

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@DrunkOnJava

RE-26 (PR #237) settled column profile authority: the OST_Columns type symbol (Tag 5755) is joined from the +0x88 list on 256/256, and its 2 ft square section matches the instance envelope at 8e-15 ft. 176/256 columns are exact in world AABB. The remaining 80 miss because Revit CUTS their bodies inset from the prism: exported plan extents run 1.4167-2.0 ft against the envelope's 2.0 ft, and both ends of the z extent already match (the old "1.583 ft in Z" was a mesh-mean metric artifact, rejected by measurement).

No section can produce an inset body — what is missing is the cutting element/relation (the thing that cuts), not the profile. Candidate carriers: the second +0x88 reference list (see #228), or a separate cut-geometry record class.

Measured on 2024_Core_Interior.rvt (sha256 c805df44...). Follow-up from PR #237.

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