Fix research complete notification using raw ID instead of display name

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

packages/game-engine/src/tick.test.ts

@@ -122,8 +122,11 @@ describe('processTick', () => {
       },
     });
     const result = processTick(state);
-    const notifications = (result as Record<string, unknown>)['_notifications'] as Array<{ title: string }>;
-    expect(notifications.some(n => n.title === 'Research Complete')).toBe(true);
+    const notifications = (result as Record<string, unknown>)['_notifications'] as Array<{ title: string; message: string }>;
+    const researchNotif = notifications.find(n => n.title === 'Research Complete');
+    expect(researchNotif).toBeDefined();
+    expect(researchNotif!.message).toContain('Advanced Cooling');
+    expect(researchNotif!.message).not.toContain('advanced-cooling');
     expect(result.research!.completedResearch).toContain('advanced-cooling');
   });
 

packages/game-engine/src/tick.ts

@@ -66,13 +66,12 @@ export function processTick(state: GameState): Partial<GameState> {
   const researchResult = processResearch(snap, compute);
 
   if (researchResult.researchCompleted) {
+    const completedNode = TECH_TREE.find(n => n.id === researchResult.researchCompleted);
     notifications.push({
       title: 'Research Complete',
-      message: `${researchResult.researchCompleted} has been unlocked!`,
+      message: `${completedNode?.name ?? researchResult.researchCompleted} has been unlocked!`,
       type: 'success',
     });
-
-    const completedNode = TECH_TREE.find(n => n.id === researchResult.researchCompleted);
     if (completedNode) {
       for (const effect of completedNode.effects) {
         if (effect.type === 'unlock_product_line') {