feat(thought): add mood-contextual emoji picker

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/llm/__tests__/thoughtEmoji.test.ts

@@ -0,0 +1,44 @@
+import { describe, it, expect } from 'vitest';
+import { pickThoughtEmoji, type ThoughtContext } from '../thoughtEmoji.js';
+
+describe('pickThoughtEmoji', () => {
+  it('returns hungry emoji when hunger is critical', () => {
+    expect(pickThoughtEmoji({ trigger: 'need_critical', hunger: 15, energy: 80 })).toBe('🍖');
+  });
+
+  it('returns tired emoji when energy is critical', () => {
+    expect(pickThoughtEmoji({ trigger: 'need_critical', hunger: 80, energy: 10 })).toBe('😴');
+  });
+
+  it('returns hungry emoji when both are critical (hunger wins)', () => {
+    expect(pickThoughtEmoji({ trigger: 'need_critical', hunger: 10, energy: 10 })).toBe('🍖');
+  });
+
+  it('returns happy emoji for positive interaction', () => {
+    expect(pickThoughtEmoji({ trigger: 'post_interaction', interactionPositive: true })).toBe('😊');
+  });
+
+  it('returns frustrated emoji for negative interaction', () => {
+    expect(pickThoughtEmoji({ trigger: 'post_interaction', interactionPositive: false })).toBe('😤');
+  });
+
+  it('returns thinking emoji for idle trigger', () => {
+    expect(pickThoughtEmoji({ trigger: 'idle' })).toBe('🤔');
+  });
+
+  it('returns thinking emoji for periodic trigger', () => {
+    expect(pickThoughtEmoji({ trigger: 'periodic' })).toBe('🤔');
+  });
+
+  it('returns happy emoji for tier_change positive', () => {
+    expect(pickThoughtEmoji({ trigger: 'tier_change', interactionPositive: true })).toBe('😊');
+  });
+
+  it('returns frustrated emoji for tier_change negative', () => {
+    expect(pickThoughtEmoji({ trigger: 'tier_change', interactionPositive: false })).toBe('😤');
+  });
+
+  it('returns fallback for unknown trigger', () => {
+    expect(pickThoughtEmoji({ trigger: 'unknown' as any })).toBe('💭');
+  });
+});

server/src/llm/thoughtEmoji.ts

@@ -0,0 +1,24 @@
+export interface ThoughtContext {
+  trigger: 'need_critical' | 'post_interaction' | 'tier_change' | 'idle' | 'periodic';
+  hunger?: number;
+  energy?: number;
+  interactionPositive?: boolean;
+}
+
+export function pickThoughtEmoji(ctx: ThoughtContext): string {
+  switch (ctx.trigger) {
+    case 'need_critical': {
+      const hunger = ctx.hunger ?? 100;
+      const energy = ctx.energy ?? 100;
+      return hunger <= energy ? '🍖' : '😴';
+    }
+    case 'post_interaction':
+    case 'tier_change':
+      return ctx.interactionPositive ? '😊' : '😤';
+    case 'idle':
+    case 'periodic':
+      return '🤔';
+    default:
+      return '💭';
+  }
+}