Overhaul market system with shared TAM competition, multi-tier pricing, enterprise pipeline, and developer ecosystem

Replaces the simplified single-subscriber market with a full competitive simulation:
shared TAM with softmax market shares across 4 segments, multi-tier consumer
subscriptions (Free/Plus/Pro/Team) and API tiers (Free/PAYG/Scale/Enterprise),
enterprise sales pipeline (Lead→Qualification→POC→Negotiation→Active→Renewal)
with SLA tracking, developer ecosystem flywheel, technology obsolescence pressure,
seasonal demand cycles, and two new product lines (Code Assistant, AI Agents Platform).

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

packages/game-engine/src/systems/market/obsolescenceSystem.ts

@@ -0,0 +1,39 @@
+import type { ObsolescenceState, Era } from '@ai-tycoon/shared';
+import {
+  OBSOLESCENCE_BASELINE_GROWTH,
+  OBSOLESCENCE_ERA_ACCELERATOR,
+  FRESHNESS_DECAY_RATE,
+  NEW_MODEL_BOOST_TICKS,
+} from '@ai-tycoon/shared';
+
+export function updateObsolescence(
+  obs: ObsolescenceState,
+  era: Era,
+  currentTick: number,
+): ObsolescenceState {
+  const accelerator = OBSOLESCENCE_ERA_ACCELERATOR[era];
+  const newBaseline = obs.marketQualityBaseline + OBSOLESCENCE_BASELINE_GROWTH * accelerator;
+
+  const ticksSinceRelease = currentTick - obs.lastModelReleaseTick;
+  const freshness = obs.lastModelReleaseTick > 0
+    ? Math.max(0, 1 - ticksSinceRelease * FRESHNESS_DECAY_RATE)
+    : 0;
+
+  const boostRemaining = Math.max(0, obs.newModelBoostRemaining - 1);
+
+  return {
+    ...obs,
+    marketQualityBaseline: newBaseline,
+    playerModelFreshness: freshness,
+    newModelBoostRemaining: boostRemaining,
+  };
+}
+
+export function onModelDeployed(obs: ObsolescenceState, tick: number): ObsolescenceState {
+  return {
+    ...obs,
+    playerModelFreshness: 1.0,
+    lastModelReleaseTick: tick,
+    newModelBoostRemaining: NEW_MODEL_BOOST_TICKS,
+  };
+}