Fix consumer subscription pricing exploit with perceived-value-based elasticity

Players could set astronomical prices and still retain subscribers because
price elasticity floored at 10% for any price above $100, satisfaction
ignored pricing entirely, and churn had no price component.

Introduces perceived value per tier (model quality × reputation), replaces
the broken linear formula with sigmoid decay, adds price-aware satisfaction
blending, and applies per-tier price-based churn multipliers.

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

packages/shared/src/constants/gameBalance.ts

@@ -873,6 +873,21 @@ export const TIER_CHURN_RATES: Record<ConsumerTierId, number> = {
 
 export const FREE_TIER_ADOPTION_RATE = 0.10;
 
+// --- Consumer Perceived Value ---
+
+export const CONSUMER_TIER_BASE_PERCEIVED_VALUE: Record<ConsumerTierId, number> = {
+  free: 0,
+  plus: 40,
+  pro: 120,
+  team: 80,
+};
+
+export const PERCEIVED_VALUE_REPUTATION_RANGE = { min: 0.5, max: 1.0 };
+export const PRICE_ELASTICITY_STEEPNESS = 3.0;
+export const PRICE_SATISFACTION_WEIGHT = 0.3;
+export const PRICE_CHURN_EXPONENT = 1.5;
+export const PRICE_CHURN_MAX_MULTIPLIER = 10.0;
+
 // --- API Tier Defaults ---
 
 export const API_TIER_DEFAULTS: Record<ApiTierId, { monthlyFee: number; inputPrice: number; outputPrice: number; rateLimit: number }> = {