Migration plan: sdlc/#417/audit.md (root: #417). PR 13. One path constant, one Overrides/ scan, one bearing->frame function shared by BuildingAssembler and the backdrop renderer. Verify: V-IMPORT identical incl. building coverage log; pixel-compare decals/backdrops on one building. Addresses U6 (partial).
Migration plan: sdlc/#417/audit.md (root: #417). PR 13. One path constant, one Overrides/ scan, one bearing->frame function shared by BuildingAssembler and the backdrop renderer. Verify: V-IMPORT identical incl. building coverage log; pixel-compare decals/backdrops on one building. Addresses U6 (partial).