Visual polish pass (v0.2.0): phase lighting, street lamps, marquee, dressing, night screenshots

- Phase-based lighting: sun direction/energy/color, ProceduralSkyMaterial
  gradient, and ambient per shift phase (GameManager.PHASE_LIGHTING),
  applied on phase transitions and shift start
- WorldBuilder: street lamp poles with emissive bulbs + OmniLights,
  set_night_mode(), glowing STEP LINE marquee (Label3D + emissive bars),
  crosswalk stripes, planters, low-poly street trees
- NPC avatars: per-seed height/brightness variation (deterministic LCG)
- Denser routine traffic probabilities
- capture_screenshots.gd: fast-forward to LATE phase and capture night set;
  README gallery is now 2x3 day+night; docs/screenshots regenerated
- Version bumped to 0.2.0; build/ artifacts rebuilt; Linux binary smoke-tested
- New headless tests for phased lighting config and street dressing (56 total)

src/test/tests/test_world.gd

@@ -1,7 +1,9 @@
 extends RefCounted
-## Headless tests for the procedural world and navigation mesh.
+## Headless tests for the procedural world, navigation mesh, and phase lighting.
 
 const WorldBuilder := preload("res://src/game/world_builder.gd")
+const Rules := preload("res://src/core/rules.gd")
+const GameManager := preload("res://src/game/game_manager.gd")
 
 func test_navmesh_built() -> bool:
 	var root := Node3D.new()
@@ -17,6 +19,32 @@ func test_navmesh_built() -> bool:
 	root.free()
 	return a and b
 
+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]:
+		var cfg: Variant = GameManager.PHASE_LIGHTING.get(phase, null)
+		if not (cfg is Dictionary):
+			ok = false
+			continue
+		for key in ["sun_energy", "sun_angle", "sun_color", "sky_top", "sky_horizon", "ambient", "night"]:
+			if not (cfg as Dictionary).has(key):
+				ok = false
+	return TestUtils.check(ok, "all four phases have a full lighting config")
+
+func test_street_lamps_and_marquee_built() -> bool:
+	var root := Node3D.new()
+	var builder := WorldBuilder.new(root)
+	builder.build()
+	var a := TestUtils.check(builder._street_lamps.size() >= 2, "street lamps built")
+	var b := TestUtils.check(builder.marquee_label != null, "marquee label built")
+	# Night mode raises bulb emission; day mode drops it.
+	builder.set_night_mode(true)
+	var night_on := builder._lamp_bulb_mats[0].emission_energy_multiplier > 1.0
+	builder.set_night_mode(false)
+	var day_off := builder._lamp_bulb_mats[0].emission_energy_multiplier <= 0.5
+	root.free()
+	return a and b and TestUtils.check(night_on, "lamps brighten at night") and TestUtils.check(day_off, "lamps dim in daylight")
+
 func test_door_indicator_built() -> bool:
 	var root := Node3D.new()
 	var builder := WorldBuilder.new(root)