[robDL89]

Summary

• A family baked from Blender carries BL_Length, BL_Width (larger/smaller of obj.dimensions X, Y), BL_Height (Z), BL_Area (total surface), BL_Volume (closed meshes only, never overridable) as type parameters, group Dimensions, plus BL_Thickness when set.
• Blender panel, Bake section: Family parameters (informative) with a set-from-selection button (edges for lengths, faces for area) and a reset per parameter; overrides are frozen custom properties on the object. Area and volume are computed at bake time, not in draw().
• Protocol: optional params on bake_mesh ([{name, kind, value}], SI units); validated by the new BakeParameter; family bake only, Bake together uses the host's.
• Revit: FamilyParameters adds/sets the BL_ parameters in the family, deletes stale BL_ ones, never touches others, and writes the values on every project type after the reload (which keeps overwriteParameterValues = false).
• Spec and plan in docs/superpowers/. DESIGN.md, README, CHANGELOG updated (CHANGELOG Unreleased conflicts trivially with Pull linked models and name MEP elements by system #24, Fit arcs on inclined planes as a last attempt #26, Add preview opacity from the Blender panel #27).

Test plan

• pytest 558 (parameter logic, header), xUnit 525 net8/net48 (params parsing and validation), build Revit 2024-2027 with 0 warnings
• Manual in Revit + Blender by Roberto

🤖 Generated with Claude Code