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/systems/marketSystem.ts

@@ -4,6 +4,8 @@ import {
   CONSUMER_QUALITY_GROWTH_MULTIPLIER,
   CONSUMER_BASE_CHURN,
   API_TOKENS_PER_REQUEST,
+  OPEN_SOURCE_REVENUE_PENALTY,
+  OPEN_SOURCE_TALENT_ATTRACTION,
 } from '@ai-tycoon/shared';
 
 export interface MarketTickResult {
@@ -84,13 +86,35 @@ export function processMarket(state: GameState, compute: ComputeState): MarketTi
     consumers.totalSubscribers * 100 +
     enterprise.activeContracts.reduce((s, c) => s + c.tokensPerTick, 0);
 
+  const openSourceCount = state.market.openSourcedModels.length;
+  if (openSourceCount > 0) {
+    const growthBoost = 1 + openSourceCount * OPEN_SOURCE_TALENT_ATTRACTION;
+    consumers.totalSubscribers *= growthBoost > 1 ? 1 + (growthBoost - 1) * 0.01 : 1;
+    apiRevenue *= 1 - openSourceCount * OPEN_SOURCE_REVENUE_PENALTY * 0.3;
+  }
+
+  const policy = state.market.overloadPolicy;
+  if (policy.degradeQualityUnderLoad && compute.inferenceUtilization > 0.85) {
+    consumers.satisfaction = Math.max(0, consumers.satisfaction - 0.02);
+  }
+  if (policy.prioritizeEnterprise && compute.inferenceUtilization > 0.9) {
+    consumers.satisfaction = Math.max(0, consumers.satisfaction - 0.01);
+  }
+
+  const subscriberHistory = [...(state.market.subscriberHistory || [])];
+  if (state.meta.tickCount % 60 === 0) {
+    subscriberHistory.push({ tick: state.meta.tickCount, subscribers: consumers.totalSubscribers });
+    if (subscriberHistory.length > 500) subscriberHistory.shift();
+  }
+
   return {
     marketState: {
       ...state.market,
       consumers,
       enterprise,
+      subscriberHistory,
     },
-    apiRevenue,
+    apiRevenue: Math.max(0, apiRevenue),
     subscriptionRevenue,
     totalTokenDemand,
   };