Detailed graphics pass: authored textures, humanoid NPCs, HUD feedback, asset pipeline

- tools/generate_textures.py (deterministic PIL) produces all authored PNGs:
  brick facade, concrete, asphalt, awning, skyline, vignette, HUD icons,
  access-card art (all <=1024px, power-of-two)
- WorldBuilder: textured facade/glass door/sidewalk/asphalt, striped awning
  with 'STEP LINE', generated skyline backdrop planes
- GameManager: soft sun shadows (4-split parallel); guard in 'guard' group
- NPC avatars: humanoid rig (torso/head/limbs) with archetype props (camera,
  delivery box, performer hat, protest sign, tourist backpack), procedural
  walk bob, head-turns-toward-guard attention cue
- HUD: inspection artifact cards, mode icons (flashlight/door/wand),
  per-escalation vignette, body-camera overlay (corner brackets + REC + clock)
- assets/ import convention documented; test_asset_textures_present_and_pow2
  guards the pipeline (57 tests pass)
- README tech stack updated for Gitea Actions + asset pipeline; screenshot
  gallery regenerated (day + night)

src/game/world_builder.gd

@@ -1,5 +1,11 @@
 class_name WorldBuilder
 ## Procedurally assembles a minimal Hollywood Boulevard entrance prototype:
+
+const T_BRICK := preload("res://assets/textures/brick_facade.png")
+const T_CONCRETE := preload("res://assets/textures/concrete.png")
+const T_ASPHALT := preload("res://assets/textures/asphalt.png")
+const T_AWNING := preload("res://assets/textures/awning.png")
+const T_SKYLINE := preload("res://assets/textures/skyline.png")
 ## steps, building facade, restricted door, sidewalk, pavement, and street edge.
 ## No art assets required; all geometry is BoxMesh with flat materials.
 
@@ -27,14 +33,19 @@ func build() -> void:
 	_build_crosswalk()
 	_build_street_furniture()
 	_build_guard_spawn()
+	_build_skyline_backdrop()
 	_build_navmesh()
 	set_night_mode(false)
 
-func _add_box(parent: Node3D, size: Vector3, pos: Vector3, color: Color, cast_shadow: bool = false) -> MeshInstance3D:
+func _add_box(parent: Node3D, size: Vector3, pos: Vector3, color: Color, cast_shadow: bool = false,
+		texture: Texture2D = null, uv_scale: Vector2 = Vector2(1, 1)) -> MeshInstance3D:
 	var mesh := BoxMesh.new()
 	mesh.size = size
 	var mat := StandardMaterial3D.new()
 	mat.albedo_color = color
+	if texture:
+		mat.albedo_texture = texture
+		mat.uv1_scale = Vector3(uv_scale.x, uv_scale.y, 1.0)
 	mesh.material = mat
 	var mi := MeshInstance3D.new()
 	mi.mesh = mesh
@@ -56,19 +67,23 @@ func _build_ground() -> void:
 func _build_building() -> void:
 	var building := StaticBody3D.new()
 	building.name = "Building"
-	# Main facade
-	_add_box(building, Vector3(40, 18, 4), Vector3(0, 9, -2), Color(0.35, 0.32, 0.30))
+	# Main facade (textured brick)
+	_add_box(building, Vector3(40, 18, 4), Vector3(0, 9, -2), Color(0.85, 0.8, 0.78), false, T_BRICK, Vector2(10, 5))
 	# Entrance recess + door recess frame
-	_add_box(building, Vector3(5.4, 6.4, 0.2), Vector3(0, 3.2, -4.0), Color(0.10, 0.10, 0.10))
-	# Door
-	_add_box(building, Vector3(3.0, 5.2, 0.3), Vector3(0, 2.9, -4.15), Color(0.16, 0.15, 0.13))
-	# Door window
-	_add_box(building, Vector3(1.8, 1.4, 0.34), Vector3(0, 3.8, -4.0), Color(0.5, 0.7, 0.9, 1.0))
+	_add_box(building, Vector3(5.4, 6.4, 0.2), Vector3(0, 3.2, -4.0), Color(0.08, 0.08, 0.09))
+	# Door frame and dark door
+	_add_box(building, Vector3(3.0, 5.2, 0.3), Vector3(0, 2.9, -4.15), Color(0.13, 0.12, 0.11))
+	# Door glass (semi-transparent)
+	var glass := _add_box(building, Vector3(1.8, 1.4, 0.34), Vector3(0, 3.8, -4.0), Color(0.6, 0.75, 0.9, 0.55))
+	var glass_mat := StandardMaterial3D.new()
+	glass_mat.albedo_color = Color(0.6, 0.75, 0.9, 0.45)
+	glass_mat.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
+	glass_mat.roughness = 0.15
+	glass_mat.metallic = 0.1
+	glass.material_override = glass_mat
 	# Door lock indicator (green = open, red = locked), placed beside the handle
 	door_indicator = _add_box(building, Vector3(0.18, 0.18, 0.24), Vector3(-1.8, 1.7, -4.35), Color(0.1, 0.9, 0.3))
 	door_indicator.material_override = _lock_indicator_material(Color(0.1, 0.9, 0.3))
-	# Awning sign bar
-	_add_box(building, Vector3(8, 0.5, 0.6), Vector3(0, 7.0, -3.6), Color(0.45, 0.44, 0.44))
 	var col := BoxShape3D.new()
 	col.size = Vector3(40, 18, 4)
 	var so := building.create_shape_owner(building)
@@ -96,7 +111,7 @@ func _build_steps() -> void:
 func _build_sidewalk() -> void:
 	var sidewalk := StaticBody3D.new()
 	sidewalk.name = "Sidewalk"
-	_add_box(sidewalk, Vector3(30, 0.18, 8), Vector3(0, 0.09, 8), Color(0.60, 0.58, 0.56))
+	_add_box(sidewalk, Vector3(30, 0.18, 8), Vector3(0, 0.09, 8), Color(1, 1, 1), false, T_CONCRETE, Vector2(9, 2.4))
 	var col := BoxShape3D.new()
 	col.size = Vector3(30, 0.36, 8)
 	var so := sidewalk.create_shape_owner(sidewalk)
@@ -107,7 +122,7 @@ func _build_sidewalk() -> void:
 func _build_street() -> void:
 	var street := StaticBody3D.new()
 	street.name = "Street"
-	_add_box(street, Vector3(120, 0.1, 26), Vector3(0, 0.05, 22), Color(0.13, 0.13, 0.14))
+	_add_box(street, Vector3(120, 0.1, 26), Vector3(0, 0.05, 22), Color(1, 1, 1), false, T_ASPHALT, Vector2(30, 7))
 	# Center dashes
 	for i in range(-40, 41, 4):
 		_add_box(street, Vector3(0.2, 0.02, 1.2), Vector3(i * 0.0, 0.11, 22), Color(0.85, 0.85, 0.30))
@@ -138,6 +153,9 @@ func _build_navmesh() -> void:
 	root.add_child(region)
 
 func _build_marquee() -> void:
+	## Striped awning above the door, then the neon sign strip + label.
+	var awning := _add_box(root, Vector3(10.5, 0.08, 1.8), Vector3(0, 6.55, -3.7), Color(1, 1, 1), false, T_AWNING)
+	awning.name = "Awning"
 	## Neon-style marquee strip above the door: emissive bars + a label.
 	var strip_parent := Node3D.new()
 	strip_parent.name = "Marquee"
@@ -243,6 +261,28 @@ func _plain_material(color: Color) -> StandardMaterial3D:
 	mat.albedo_color = color
 	return mat
 
+func _build_skyline_backdrop() -> void:
+	## Distant procedural skyline on four unshaded planes around the block.
+	var mat := StandardMaterial3D.new()
+	mat.albedo_texture = T_SKYLINE
+	mat.shading_mode = BaseMaterial3D.SHADING_MODE_UNSHADED
+	mat.transparency = BaseMaterial3D.TRANSPARENCY_ALPHA
+	mat.cull_mode = BaseMaterial3D.CULL_DISABLED
+	const DIST := 95.0
+	const HEIGHT := 90.0
+	for i in 4:
+		var plane := MeshInstance3D.new()
+		plane.name = "Skyline_%d" % i
+		var pm := PlaneMesh.new()
+		pm.size = Vector2(300, HEIGHT)
+		plane.mesh = pm
+		plane.material_override = mat
+		var angle := i * 90.0
+		plane.position = Vector3(sin(deg_to_rad(angle)) * DIST, HEIGHT / 2.0, cos(deg_to_rad(angle)) * DIST)
+		plane.rotation_degrees = Vector3(0, -angle + 90.0, 0)
+		plane.cast_shadow = (0 as GeometryInstance3D.ShadowCastingSetting)
+		root.add_child(plane)
+
 func _build_guard_spawn() -> void:
 	var marker := Marker3D.new()
 	marker.name = "GuardSpawn"