feat: matte anime materials — kill the glass/mirror look, keep the vibrancy

Everything read as wet plastic or glowing porcelain for two stacking
reasons, both fixed centrally:

- toonify() shipped every character/prop/weapon with a hot rim (0.45 over
  65% of the silhouette) and broad stepped specular (0.25 @ shininess 24) —
  patent-leather highlights on any dark surface. Now a thin rim (0.15/0.4)
  and a small tight glint (0.06 @ 56); shader defaults match.
- The LINEAR tonemapper clipped lit white surfaces (sun + ambient push
  facades past 1.0) and the glow pass bloomed the clip, so buildings glowed
  like porcelain. Switched to FILMIC with white=2.4: near-linear through
  the cel bands (they stay crisp), soft shoulder above 1.0. Glow threshold
  1.1 -> 1.45 so only genuine emissives (neon, tracers, plasma) bloom.
- Saturation 1.22 -> 1.3 compensates filmic mids — vibrancy unchanged.
- Neon Alley: ambient 1.7 -> 1.35 / sun 2.2 -> 2.5 — the shoulder no longer
  hides the ambient lavender cast, so let the sun shape the facades.

Co-Authored-By: Claude Fable 5 <[email protected]>

scenes/maps/neon_alley/neon_alley_builder.gd

@@ -321,14 +321,17 @@ func _build_environment() -> void:
 	# the energies the old dark flat palette needed).
 	env.environment.ambient_light_source = Environment.AMBIENT_SOURCE_COLOR
 	env.environment.ambient_light_color = Color(0.58, 0.54, 0.66)
-	env.environment.ambient_light_energy = 1.7
+	# Under the filmic shoulder the ambient's lavender tint actually shows
+	# (LINEAR used to clip it to white) — keep it lower so the sun shapes
+	# surfaces and lit faces stay bright.
+	env.environment.ambient_light_energy = 1.35
 	env.environment.fog_density = 0.0007   # light city haze for depth over 600m
 	# Ambient occlusion grounds the modeled facade detail (ZZZ-style depth)
 	env.environment.ssao_enabled = true
 	env.environment.ssao_intensity = 2.0
 	var sun := get_node_or_null("Sun")
 	if sun:
-		sun.light_energy = 2.2
+		sun.light_energy = 2.5
 		sun.rotation_degrees = Vector3(-38, 55, 0)
 		sun.directional_shadow_max_distance = 220.0