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_import_north_buildings.py

@@ -0,0 +1,115 @@
+# Import the two north-side background buildings (TCL Chinese Theatre, Madame
+# Tussaud's) into Unreal and stage them in the demo map, across the street from
+# the hero facade.
+#
+# Placement: these blockout meshes live in the same local frame as the site
+# meshes (X east / Y north / Z up, metres, origin Hollywood x Highland), which
+# are imported at the Unreal origin and land correctly via the `ue_metric_v1`
+# FBX axis mapping (north -> -Y). So the buildings are spawned at Unreal
+# (0,0,0) like the site meshes, not at the pivot-shifted hero facade position.
+#
+#   UnrealEditor-Cmd <uproject> -run=pythonscript \
+#     -script=<repo>/Tools/ue_import_north_buildings.py -nullrhi -unattended -nopause -stdout
+
+import os
+
+import unreal
+
+SRC = "/tmp/gigline/north"
+DEST = "/Game/Hollywood/North"
+LEVEL = "/Game/Hollywood/DemoMap"
+RESULT = "/tmp/gigline/north-import.txt"
+lines = []
+
+
+def log(msg):
+    lines.append(str(msg))
+    unreal.log(str(msg))
+
+
+IMPORTS = [
+    ("TCL_Chinese_Theatre.fbx", "SM_TCL_Chinese_Theatre"),
+    ("Madame_Tussauds.fbx", "SM_Madame_Tussauds"),
+]
+
+
+def import_meshes():
+    assets = unreal.EditorAssetLibrary.list_assets(DEST) if unreal.EditorAssetLibrary.does_directory_exist(DEST) else []
+    for fn, asset_name in IMPORTS:
+        unreal.AssetToolsHelpers.get_asset_tools().import_asset_tasks([unreal.AssetImportTask(
+            filename=os.path.join(SRC, fn),
+            destination_path=DEST,
+            destination_name=asset_name,
+            automated=True,
+            save=True,
+            replace_existing=True,
+            options=unreal.FbxImportUI(
+                import_mesh=True, import_materials=True, import_textures=False,
+                import_as_skeletal=False) if False else None,
+        )])
+    # FbxImportUI kwargs are unreliable across 5.8; configure explicitly below.
+
+
+def stage():
+    if unreal.EditorAssetLibrary.does_asset_exist(LEVEL):
+        unreal.EditorLevelLibrary.load_level(LEVEL)
+    for actor in list(unreal.EditorLevelLibrary.get_all_level_actors()):
+        if actor.get_actor_label().startswith("North_"):
+            unreal.EditorLevelLibrary.destroy_actor(actor)
+    for asset_name, label in (("SM_TCL_Chinese_Theatre", "North_TCL_Chinese"), ("SM_Madame_Tussauds", "North_Madame_Tussauds")):
+        mesh = unreal.EditorAssetLibrary.load_asset(f"{DEST}/{asset_name}")
+        if mesh is None:
+            log(f"MISSING {DEST}/{asset_name}")
+            continue
+        actor = unreal.EditorLevelLibrary.spawn_actor_from_class(
+            unreal.StaticMeshActor, unreal.Vector(0, 0, 0))
+        actor.set_actor_label(label)
+        comp = actor.static_mesh_component
+        comp.set_static_mesh(mesh)
+        comp.set_mobility(unreal.ComponentMobility.STATIC)
+        # Report where the mesh actually lands in world space (site-frame → Unreal).
+        box = mesh.get_bounding_box()
+        mn, mx = box.min, box.max
+        log(f"{label}: mesh world-space X {mn.x:.0f}..{mx.x:.0f}  Y {mn.y:.0f}..{mx.y:.0f}  size "
+            f"{mx.x-mn.x:.0f}x{mx.y-mn.y:.0f} cm")
+    saved = unreal.EditorLoadingAndSavingUtils.save_map(
+        unreal.EditorLevelLibrary.get_editor_world(), LEVEL)
+    log(f"save_map {LEVEL}: {saved}")
+
+
+def main():
+    for fn, asset_name in IMPORTS:
+        task = unreal.AssetImportTask()
+        task.filename = os.path.join(SRC, fn)
+        task.destination_path = DEST
+        task.destination_name = asset_name
+        task.automated = True
+        task.save = True
+        task.replace_existing = True
+        ui = unreal.FbxImportUI()
+        ui.import_mesh = True
+        ui.import_materials = True
+        ui.import_textures = False
+        ui.import_as_skeletal = False
+        smd = ui.static_mesh_import_data
+        smd.import_uniform_scale = 1.0
+        smd.combine_meshes = True
+        smd.convert_scene_unit = False
+        smd.force_front_x_axis = False
+        smd.normal_import_method = unreal.FBXNormalImportMethod.FBXNIM_IMPORT_NORMALS
+        task.options = ui
+        unreal.AssetToolsHelpers.get_asset_tools().import_asset_tasks([task])
+        log(f"imported {asset_name}")
+    unreal.EditorLoadingAndSavingUtils.save_dirty_packages(True, True)
+    stage()
+
+
+try:
+    main()
+except Exception as exc:  # noqa
+    import traceback
+    log(f"FAILED: {type(exc).__name__}: {exc}")
+    log(traceback.format_exc())
+
+with open(RESULT, "w") as f:
+    f.write("\n".join(lines) + "\n")