feat: refine nightdrive world and authored car

Integrate the Blender grand tourer with a cohesive shader-driven road, terrain, atmosphere, lighting, and post-processing pass. Refine responsive drive dynamics and sign lifecycle behavior, and add durable visual, accessibility, and performance verification evidence.

docs/reviews/evidence/nightdrive-iteration/final/browser-console.json

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+{
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+}

docs/reviews/evidence/nightdrive-iteration/final/devtools-profile.json

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+    "p95FrameTimeMs": 12.4,
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+  "memory": {
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+    "materials": 22,
+    "textures": 2,
+    "estimatedGeometry": "540.3 KB",
+    "estimatedTextures": "1.0 MB",
+    "estimatedTotal": "1.5 MB"
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+  "disposal": {
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+    "orphanedTextures": 0
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+  "browserConsoleErrors": 0,
+  "notes": [
+    "The inspector confirmed the named shader-world and authored-car hierarchy.",
+    "The inspector could not auto-discover the closure-owned EffectComposer; source and unit coverage confirm RenderPass, UnrealBloomPass, and final OutputPass ordering.",
+    "The separate authenticated High-tier allocation trace ran at 1440x900, DPR 2, renderer pixel ratio 1.5."
+  ]
+}

docs/reviews/evidence/nightdrive-iteration/refinement/browser-console.json

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+{
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+}

docs/reviews/evidence/nightdrive-iteration/refinement/runtime-budget-trace.v1.json

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+}