Extract per-venue geometry specs into WorldBuilder

Add the Hollywood, Joke Shop and TV Studio tables for facade, window,
stair, street, nav, guard-spawn and feature data. Unknown ids fall back to
the boulevard. Use the specs for the core dimensions and gates, with a headless
test for the distinct venue data. Headless 230/230.

src/test/tests/test_world.gd

@@ -19,6 +19,39 @@ func test_navmesh_built() -> bool:
 	root.free()
 	return a and b
 
+func test_venue_geometry_specs_are_distinct_and_defaulted() -> bool:
+	var hollywood := WorldBuilder.new(Node3D.new())
+	var joke := WorldBuilder.new(Node3D.new(), "joke_shop")
+	var studio := WorldBuilder.new(Node3D.new(), "tv_studio")
+	var unknown := WorldBuilder.new(Node3D.new(), "not_a_venue")
+	var a := TestUtils.check(hollywood.venue_id == "hollywood_building",
+		"the default venue is Hollywood")
+	var b := TestUtils.check(float(hollywood.spec["facade_width"]) > float(joke.spec["facade_width"]),
+		"the Joke Shop alley is narrower than the boulevard")
+	var c := TestUtils.check(not bool(joke.spec["features"]["skyline"])
+		and not bool(joke.spec["features"]["marquee"]),
+		"the Joke Shop disables the skyline and marquee")
+	var d := TestUtils.check(bool(studio.spec["features"]["bulb_canopy"])
+		and not bool(studio.spec["features"]["marquee"]),
+		"the studio uses a bulb canopy instead of the marquee")
+	var e := TestUtils.check(unknown.venue_id == "hollywood_building",
+		"an unknown venue falls back to Hollywood")
+	var root := Node3D.new()
+	var builder := WorldBuilder.new(root, "joke_shop")
+	builder.build()
+	var body := root.find_child("Building", true, false)
+	var facade := body.get_child(0) as MeshInstance3D if body != null else null
+	var f := TestUtils.check(facade != null and (facade.mesh as BoxMesh).size.x < 20.0,
+		"the Joke Shop builds the narrow facade")
+	var g := TestUtils.check(root.find_child("SkylineBackdrop", true, false) == null,
+		"the Joke Shop builds no skyline ring")
+	hollywood.root.free()
+	joke.root.free()
+	studio.root.free()
+	unknown.root.free()
+	root.free()
+	return a and b and c and d and e and f and g
+
 func test_phase_lighting_config_covered() -> bool:
 	var ok := true
 	for phase in [Rules.Phase.EARLY, Rules.Phase.MIDDAY, Rules.Phase.EVENING, Rules.Phase.LATE]: