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/level_environment.gd

@@ -91,18 +91,23 @@ static func make_environment(sky_variant: String = "day") -> Environment:
 	environment.ambient_light_source = Environment.AMBIENT_SOURCE_SKY
 	environment.ambient_light_energy = 0.55
 
-	# Filmic crushes the cel bands; linear-ish keeps them crisp.
-	environment.tonemap_mode = Environment.TONE_MAPPER_LINEAR
+	# Filmic with a high white point: near-linear through the cel bands (they
+	# stay crisp) but a soft shoulder above 1.0. LINEAR clipped lit white
+	# surfaces and then bloomed the clip — every facade glowed like porcelain.
+	environment.tonemap_mode = Environment.TONE_MAPPER_FILMIC
+	environment.tonemap_white = 2.4
 
-	# Bloom sells emissives (tracers, plasma, rim highlights).
+	# Bloom for genuine emissives only (tracers, plasma, neon) — lit geometry
+	# must never cross this threshold or it reads as glowing glass.
 	environment.glow_enabled = true
-	environment.glow_intensity = 0.5
+	environment.glow_intensity = 0.4
 	environment.glow_bloom = 0.05
-	environment.glow_hdr_threshold = 1.1
+	environment.glow_hdr_threshold = 1.45
 
-	# Cel color grade: punchy saturation, hint of contrast.
+	# Cel color grade: punchy saturation, hint of contrast (bumped a touch to
+	# make up for filmic's slightly tamer mids — vibrancy stays).
 	environment.adjustment_enabled = true
-	environment.adjustment_saturation = 1.22
+	environment.adjustment_saturation = 1.3
 	environment.adjustment_contrast = 1.05
 
 	# A touch of depth haze for scale; far enough to not gray the arena.