feat: implement Timmy's mood lighting for Nexus atmosphere

app.js

@@ -14,7 +14,14 @@ const NEXUS = {
     constellationLine: 0x334488,
     constellationFade: 0x112244,
     accent: 0x4488ff,
-  }
+  },
+  moods: {
+    content: { bg: 0x002828, ambient: 1.4, particleIntensity: 0.9, particleSpeed: 0.01 },
+    busy: { bg: 0x003838, ambient: 1.8, particleIntensity: 1.2, particleSpeed: 0.02 },
+    contemplative: { bg: 0x000818, ambient: 0.8, particleIntensity: 0.6, particleSpeed: 0.005 },
+    error: { bg: 0x280808, ambient: 1.0, particleIntensity: 0.8, particleSpeed: 0.01 }
+  },
+  currentMood: 'content'
 };
 
 // === ASSET LOADER ===
@@ -343,6 +350,37 @@ window.addEventListener('resize', () => {
 // === ANIMATION LOOP ===
 const clock = new THREE.Clock();
 
+// Mood derivation variables
+let chatActivity = 0;
+let prMergeRate = 0;
+let errorCount = 0;
+let lastMoodUpdate = 0;
+
+/**
+ * Derives Timmy's mood based on current metrics.
+ */
+function deriveMood() {
+  const now = clock.getElapsedTime();
+  if (now - lastMoodUpdate < 5) return; // Update mood every 5 seconds
+  lastMoodUpdate = now;
+  
+  if (errorCount > 3) {
+    NEXUS.currentMood = 'error';
+  } else if (chatActivity > 5 || prMergeRate > 1) {
+    NEXUS.currentMood = 'busy';
+  } else if (chatActivity < 2 && prMergeRate === 0) {
+    NEXUS.currentMood = 'contemplative';
+  } else {
+    NEXUS.currentMood = 'content';
+  }
+  
+  // Update scene atmosphere based on mood
+  const mood = NEXUS.moods[NEXUS.currentMood];
+  scene.background = new THREE.Color(mood.bg);
+  ambientLight.intensity = mood.ambient;
+  starMaterial.opacity = mood.particleIntensity;
+}
+
 /**
  * Main animation loop — called each frame via requestAnimationFrame.
  * @returns {void}
@@ -351,6 +389,9 @@ function animate() {
   // Only start animation after assets are loaded
   requestAnimationFrame(animate);
   const elapsed = clock.getElapsedTime();
+  
+  // Update mood based on metrics
+  deriveMood();
 
   // Smooth camera transition for overview mode
   const targetT = overviewMode ? 1 : 0;
@@ -440,6 +481,10 @@ import { wsClient } from './ws-client.js';
 
 wsClient.connect();
 
+// Simulate error count for mood derivation (replace with real error tracking)
+setInterval(() => {
+  if (Math.random() < 0.1) errorCount++;
+}, 10000);
 window.addEventListener('player-joined', (/** @type {CustomEvent} */ event) => {
   console.log('Player joined:', event.detail);
 });
@@ -450,6 +495,7 @@ window.addEventListener('player-left', (/** @type {CustomEvent} */ event) => {
 
 window.addEventListener('chat-message', (/** @type {CustomEvent} */ event) => {
   console.log('Chat message:', event.detail);
+  chatActivity++;
   if (typeof event.detail?.text === 'string' && event.detail.text.toLowerCase().includes('sovereignty')) {
     triggerSovereigntyEasterEgg();
   }
@@ -615,7 +661,10 @@ async function initCommitBanners() {
     ];
 
     // Load commit banners after assets are ready
-    initCommitBanners();
+initCommitBanners();
+
+// Update PR merge rate for mood derivation
+prMergeRate++;
   }
 
   const spreadX = [-7, -3.5, 0, 3.5, 7];