Add Week 4 social features, regulation, and safety tradeoffs

Leaderboard page with category tabs and score submission, shareable
company stats card with clipboard copy, dynamic regulation system
(compliance costs scale with capability and era, regulatory standing
tracks safety research), 6 geopolitical events (export controls, energy
crisis, natural disaster, AI safety summit, immigration policy, data
sovereignty), safety-capability tradeoff (safety score affects benchmark,
low safety triggers incidents with reputation damage), and enhanced
event consequence handling for regulation and talent types.

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

packages/game-engine/src/systems/economySystem.ts

@@ -1,5 +1,5 @@
 import type { GameState, EconomyState, InfrastructureState } from '@ai-tycoon/shared';
-import { FINANCIAL_SNAPSHOT_INTERVAL, MAX_FINANCIAL_HISTORY } from '@ai-tycoon/shared';
+import { FINANCIAL_SNAPSHOT_INTERVAL, MAX_FINANCIAL_HISTORY, REGULATION_COMPLIANCE_PER_CAPABILITY } from '@ai-tycoon/shared';
 import type { MarketTickResult } from './marketSystem';
 
 export function processEconomy(
@@ -15,7 +15,12 @@ export function processEconomy(
 
   const talentExpenses = state.talent.totalSalaryPerTick;
   const dataExpenses = state.data.partnerships.reduce((sum, p) => sum + p.costPerTick, 0);
-  const expenses = infraExpenses + talentExpenses + dataExpenses;
+
+  const bestCapability = state.models.trainedModels.reduce((best, m) => Math.max(best, m.benchmarkScore), 0);
+  const eraIdx = ['startup', 'scaleup', 'bigtech', 'agi'].indexOf(state.meta.currentEra);
+  const complianceCost = bestCapability > 30 ? bestCapability * REGULATION_COMPLIANCE_PER_CAPABILITY * (1 + eraIdx * 0.5) / 100 : 0;
+
+  const expenses = infraExpenses + talentExpenses + dataExpenses + complianceCost;
 
   const money = state.economy.money + revenue - expenses;