Add powered neon wire rendering

shaders.lua

@@ -89,6 +89,45 @@ goopShader = love.graphics.newShader[[
   }
 ]]
 
+-- Wires are drawn as primitives rather than textured sprites, but LÖVE still
+-- runs this shader over its default white texture. Inactive runs stay visibly
+-- connected at half brightness; powered runs get a travelling neon shimmer,
+-- occasional tube-like noise, and a sub-pixel bend rather than a global fade.
+wireNeonShader = love.graphics.newShader[[
+  extern number wirePower;
+  extern number wireTime;
+  extern number wirePhase;
+
+  float wireHash(vec2 point) {
+    return fract(sin(dot(point, vec2(127.1, 311.7))) * 43758.5453123);
+  }
+
+  vec4 position(mat4 transformProjection, vec4 vertexPosition) {
+    if (wirePower < 0.5) return transformProjection * vertexPosition;
+
+    // Every segment sharing an endpoint receives the same offset, so corners
+    // stay connected while the live current gives the tube a gentle movement.
+    float wave = sin(vertexPosition.x * 0.085 + vertexPosition.y * 0.13 +
+      wireTime * 4.4 + wirePhase * 9.0);
+    float wobble = wave * 0.32;
+    vertexPosition.xy += vec2(wobble, -wobble * 0.55);
+    return transformProjection * vertexPosition;
+  }
+
+  vec4 effect(vec4 color, Image texture, vec2 textureCoords, vec2 screenCoords) {
+    if (wirePower < 0.5) return vec4(color.rgb * 0.50, color.a * 0.72);
+
+    float travel = dot(screenCoords, vec2(0.070, 0.043)) - wireTime * 6.8 + wirePhase * 13.0;
+    float shimmer = sin(travel) * 0.075 + sin(travel * 2.37 + 1.7) * 0.035;
+    vec2 noiseCell = floor(screenCoords * 0.34) + floor(wireTime * 15.0) * vec2(1.0, -1.0);
+    float noise = wireHash(noiseCell + wirePhase);
+    float flicker = max(0.0, noise - 0.82) * 0.32;
+    float brightness = 0.92 + shimmer + flicker;
+    float alpha = 0.84 + shimmer * 0.80 + flicker * 0.55;
+    return vec4(color.rgb * brightness, color.a * alpha);
+  }
+]]
+
 function drawGoopySprite(sprite, x, y, scale)
 	local w, h = sprite:getWidth(), sprite:getHeight()
 	local time = love.timer.getTime()