fix(blockout): regenerate with --origin; frontage back on the verified spans

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The 0.1.2 blockout regeneration ran without --origin, so Blosm centred on the
extract instead of fitting the project frame. The frontage shifted ~119 m in X and
~2.4 m in Y and the hero fell outside the 6902/6838 gap - the verified placement
was silently undone, while every render still looked like a plausible block.

- Blockout regenerated with --origin 34.101545,-118.338718 (affine residual 0.0 cm);
  frontage and north buildings re-exported and re-imported.
- Verified spans restored: 6922 -24276..-17700, 6902 -17749..-14591, hero
  -14644..-12028 between them, theatre -12082..-8210, TCL -22889..-18442,
  Tussaud's -27071..-22799.
- ue_apply_facade_kit now uses get_actor_bounds() (world space). It had used the
  static mesh bounding box, which is building-line-local, so every kit piece was
  placed ~12 km east of its building in empty ground.
- ue_import_north_buildings.py was missing 'import sys' (NameError, exit 255,
  import silently skipped) - the same trap as the hero importer.
- Kit re-applied: 625 pieces across eight buildings; packaged QA still PASS
  (walk, transect 0 holes, wall probe 0/35, facade probe 0/9).

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