Add portal web simulator, SPI bridges, and Pico firmware updates.

Bring the five-panel hex portal online with a browser 3D/schematic preview, Pi SPI backends, and renamed multi-panel Pico UDP firmware.

Co-authored-by: Cursor <cursoragent@cursor.com>

web/vendor/shaders/LuminosityHighPassShader.js

@@ -0,0 +1,64 @@
+import {
+	Color
+} from 'three';
+
+/**
+ * Luminosity
+ * http://en.wikipedia.org/wiki/Luminosity
+ */
+
+const LuminosityHighPassShader = {
+
+	name: 'LuminosityHighPassShader',
+
+	shaderID: 'luminosityHighPass',
+
+	uniforms: {
+
+		'tDiffuse': { value: null },
+		'luminosityThreshold': { value: 1.0 },
+		'smoothWidth': { value: 1.0 },
+		'defaultColor': { value: new Color( 0x000000 ) },
+		'defaultOpacity': { value: 0.0 }
+
+	},
+
+	vertexShader: /* glsl */`
+
+		varying vec2 vUv;
+
+		void main() {
+
+			vUv = uv;
+
+			gl_Position = projectionMatrix * modelViewMatrix * vec4( position, 1.0 );
+
+		}`,
+
+	fragmentShader: /* glsl */`
+
+		uniform sampler2D tDiffuse;
+		uniform vec3 defaultColor;
+		uniform float defaultOpacity;
+		uniform float luminosityThreshold;
+		uniform float smoothWidth;
+
+		varying vec2 vUv;
+
+		void main() {
+
+			vec4 texel = texture2D( tDiffuse, vUv );
+
+			float v = luminance( texel.xyz );
+
+			vec4 outputColor = vec4( defaultColor.rgb, defaultOpacity );
+
+			float alpha = smoothstep( luminosityThreshold, luminosityThreshold + smoothWidth, v );
+
+			gl_FragColor = mix( outputColor, texel, alpha );
+
+		}`
+
+};
+
+export { LuminosityHighPassShader };