Remove cyberpunk overlay from game scene

The CRT/glitch dressing (scanlines, vignette, glitch burst) was visually distracting during gameplay. Strip the CyberOverlay import, creation, update, and destroy calls from GameScene and drop the now-unused `theme.gameScene` config block.

data/theme.json

@@ -32,11 +32,5 @@
     "duration": [110, 340],
     "slices": [2, 6],
     "maxOffset": 12
-  },
-  "gameScene": {
-    "overlay": true,
-    "scanlineAlpha": 0.1,
-    "vignetteAlpha": 0.45,
-    "burstOnEntry": true
   }
 }

js/scenes/GameScene.js

@@ -8,7 +8,6 @@ import { formatSystemReport } from '../galaxy/SystemReport.js';
 import { Ship } from '../entities/Ship.js';
 import { Planet } from '../entities/Planet.js';
 import { Starfield } from '../visuals/Starfield.js';
-import { CyberOverlay } from '../visuals/CyberOverlay.js';
 
 const FONT_FALLBACK = "'Segoe UI', 'Helvetica Neue', Arial, sans-serif";
 const HEADER_FONT = () => fontStack('header', FONT_FALLBACK);
@@ -43,14 +42,6 @@ export class GameScene extends Phaser.Scene {
     this.cameraFollowShip = config.get('game.camera.followShip', true);
     this.cameraFollowRate = config.get('game.camera.followRate', 3.0); // 1/s
 
-    // The shared cyberpunk dressing (scanlines, vignette, occasional
-    // glitch burst) — the same overlay the menu uses, dialed down.
-    this.overlay = this.createThemeOverlay();
-    if (this.overlay && config.get('theme.gameScene.burstOnEntry', true)) {
-      // One arrival glitch when we cut in from the menu.
-      this.time.delayedCall(350, () => this.overlay?.trigger(320, 0.8));
-    }
-
     // We are, after all, in a system. Show the player which one. (This
     // also establishes the galaxy — and its seed — for what follows.)
     this.createSystemHud();
@@ -162,39 +153,12 @@ export class GameScene extends Phaser.Scene {
     line(`seed ${this.galaxy.seed}`, { fontFamily: fam, fontSize: '11px', color: '#3d476b' });
   }
 
-  /**
-   * The shared CRT/glitch overlay for this scene (data/theme.json →
-   * gameScene + overlay/glitch). Dialed down vs. the menu: fainter
-   * scanlines, lighter vignette — dressing, not the star of the show.
-   */
-  createThemeOverlay() {
-    const theme = config.section('theme', {});
-    const gs = config.section('theme.gameScene', {});
-    if (gs.overlay === false) return null;
-    const overlay = theme.overlay ?? {};
-    return new CyberOverlay(this, {
-      scanline: {
-        pitch: overlay.scanline?.pitch ?? 3,
-        alpha: gs.scanlineAlpha ?? overlay.scanline?.alpha ?? 0.1,
-      },
-      grid: overlay.grid
-        ? { cell: overlay.grid.cell ?? 48, alpha: (overlay.grid.alpha ?? 0.05) * 0.6 }
-        : undefined,
-      vignette: overlay.vignette
-        ? { alpha: gs.vignetteAlpha ?? overlay.vignette.alpha ?? 0.4 }
-        : undefined,
-      sweep: overlay.sweep,
-      glitch: theme.glitch,
-    });
-  }
-
   update(_time, delta) {
     // Phaser v4 (Giedi): the engine does not step the scene's TimeClock or
     // TweenManager — drive them here or delayedCall/addEvent/tweens never
     // fire. (Same quirk as MenuScene.update; verified Sept 2026.)
     this.time.update(_time, delta);
     this.tweens.update();
-    this.overlay?.update(_time, delta);
     this.ship.update(_time, delta);
     // The home world is solid: the ship may come within the clearance in
     // data/planets.json of its rim, but never closer (or through it).
@@ -253,6 +217,5 @@ export class GameScene extends Phaser.Scene {
 
   shutdown() {
     this.starfield?.destroy();
-    this.overlay?.destroy();
   }
 }