asset: two north-side background buildings across Hollywood Blvd

- TCL Chinese Theatre (6925) and Madame Tussaud's (6933) exported from the
  verified OSM blockout with ue_metric_v1 (export_north_buildings.py), with a
  Y-mirror so they land north of the road, across from the hero facade.
- ue_import_north_buildings.py imports + stages them in the DemoMap as
  North_TCL_Chinese / North_Madame_Tussauds (TCL Y 1802..9431, Tussaud's
  1888..7586; hero at Y -1450, road centreline ~0).
- render_screenshots.sh now also runs the DemoMap capture pass; added a
  demo-north-buildings camera, so the new buildings get a review shot.
- README/roadmap updated; flat facade materials pending the 0.1.4 patch.

Tools/ue_build_review_map.py

@@ -201,6 +201,9 @@ try:
             ("demo-spawn-view", unreal.Vector(-10722.5, -3500, 165), unreal.Vector(-10722.5, -1450, 700)),
             ("demo-street-level", unreal.Vector(-11000, -400, 165), unreal.Vector(-10722.5, -1450, 500)),
             ("demo-crossing", unreal.Vector(-13600, -1650, 165), unreal.Vector(-12722.5, -1450, 500)),
+            # the two north-side background buildings (TCL, Tussaud's) seen from
+            # the south sidewalk, across Hollywood Blvd: their frontage and mass.
+            ("demo-north-buildings", unreal.Vector(-22800, -1000, 400), unreal.Vector(-22800, 3000, 300)),
         ]
         seq = spawn(unreal.GigLineShotActor, unreal.Vector(0, 0, 300), "ShotSequencer")
         if seq:
@@ -208,7 +211,9 @@ try:
             seq.set_editor_property("shot_rotations",
                                     [unreal.MathLibrary.find_look_at_rotation(c[1], c[2]) for c in demo_shots])
             seq.set_editor_property("shot_names", [c[0] for c in demo_shots])
-            seq.set_editor_property("quit_when_done", False)
+            # quit after the demo shots so a dedicated DemoMap capture run
+            # terminates cleanly (render_screenshots.sh runs both maps).
+            seq.set_editor_property("quit_when_done", True)
         saved = unreal.EditorLoadingAndSavingUtils.save_map(
             unreal.EditorLevelLibrary.get_editor_world(), "/Game/Hollywood/DemoMap")
         log(f"demo map staged: {len(demo_shots)} cameras, save {saved}")