Add Week 3 polish and late-game features

VC funding system (seed through IPO with requirements gating), 15
achievements with engine checker, model tuning presets and unlockable
sliders, overload policy controls, open-source mechanic with reputation
boost, enhanced Recharts analytics (subscriber/reputation/revenue vs
expenses charts), M&A acquisition system, sidebar NEW badges on era
transitions, tutorial hints, and wired-up settings toggles.

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

packages/game-engine/src/tick.ts

@@ -1,4 +1,4 @@
-import type { GameState, EventDefinition } from '@ai-tycoon/shared';
+import type { GameState, EventDefinition, AchievementDefinition } from '@ai-tycoon/shared';
 import { processEconomy } from './systems/economySystem';
 import { processInfrastructure } from './systems/infrastructureSystem';
 import { processCompute } from './systems/computeSystem';
@@ -11,6 +11,8 @@ import { processEvents } from './systems/eventSystem';
 import { processCompetitors } from './systems/competitorSystem';
 import { processData } from './systems/dataSystem';
 import { checkEraTransition } from './systems/eraSystem';
+import { processAchievements } from './systems/achievementSystem';
+import { computeValuation } from './systems/fundingSystem';
 
 export interface TickResult {
   state: Partial<GameState>;
@@ -24,11 +26,16 @@ export interface TickNotification {
 }
 
 let cachedEventDefs: EventDefinition[] | null = null;
+let cachedAchievementDefs: AchievementDefinition[] | null = null;
 
 export function setEventDefinitions(defs: EventDefinition[]) {
   cachedEventDefs = defs;
 }
 
+export function setAchievementDefinitions(defs: AchievementDefinition[]) {
+  cachedAchievementDefs = defs;
+}
+
 export function processTick(state: GameState): Partial<GameState> {
   const notifications: TickNotification[] = [];
 
@@ -102,9 +109,43 @@ export function processTick(state: GameState): Partial<GameState> {
     });
   }
 
+  const valuation = computeValuation({ ...stateWithTalent, economy, reputation, research: researchResult.research });
+  const updatedEconomy = {
+    ...economy,
+    funding: { ...economy.funding, valuation },
+  };
+
+  const stateForAchievements: GameState = {
+    ...stateWithTalent,
+    meta,
+    economy: updatedEconomy,
+    infrastructure,
+    compute,
+    research: researchResult.research,
+    models: modelResult.modelsState,
+    market: market.marketState,
+    reputation,
+    data,
+    competitors,
+    events: eventResult.events,
+    achievements: state.achievements,
+  };
+
+  const achievementResult = cachedAchievementDefs
+    ? processAchievements(stateForAchievements, cachedAchievementDefs)
+    : { achievements: state.achievements, newAchievements: [] };
+
+  for (const name of achievementResult.newAchievements) {
+    notifications.push({
+      title: 'Achievement Unlocked!',
+      message: name,
+      type: 'success',
+    });
+  }
+
   const result: Partial<GameState> = {
     meta,
-    economy,
+    economy: updatedEconomy,
     infrastructure,
     compute,
     research: researchResult.research,
@@ -115,6 +156,7 @@ export function processTick(state: GameState): Partial<GameState> {
     data,
     competitors,
     events: eventResult.events,
+    achievements: achievementResult.achievements,
   };
 
   (result as Record<string, unknown>)['_notifications'] = notifications;