Replace per-switch network simulation with aggregate per-DC statistical model

Eliminates the 22K-object switchRegistry that caused O(n×m) scans 4x per tick.
Network health is now tracked as aggregate counts per tier (totalByTier/healthyByTier)
with RepairBatch timers, cutting late-game tick cost from ~50ms to ~0.3ms.

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

packages/shared/src/types/infrastructure.ts

@@ -91,24 +91,6 @@ export interface DataCenter {
 // --- Network Topology (6-Tier Clos) ---
 
 export type SwitchTier = 'tor' | 't1' | 't2' | 't3' | 't4' | 't5';
-export type SwitchStatus = 'healthy' | 'failed' | 'repairing';
-
-export interface NetworkSwitch {
-  id: string;
-  tier: SwitchTier;
-  status: SwitchStatus;
-  dcId: string | null;
-  campusId: string | null;
-  clusterId: string | null;
-  uplinkIds: string[];
-  downlinkIds: string[];
-  activeUplinks: number;
-  totalUplinks: number;
-  effectiveBandwidth: number;
-  repairProgress: number;
-  repairTotal: number;
-}
-
 export interface SwitchTierConfig {
   tier: SwitchTier;
   name: string;
@@ -121,11 +103,17 @@ export interface SwitchTierConfig {
   powerDrawKW: number;
 }
 
+export interface RepairBatch {
+  tier: SwitchTier;
+  count: number;
+  ticksRemaining: number;
+}
+
 export interface DCNetworkSummary {
-  switchIds: string[];
-  networkRackCount: number;
   totalByTier: Partial<Record<SwitchTier, number>>;
   healthyByTier: Partial<Record<SwitchTier, number>>;
+  repairBatches: RepairBatch[];
+  networkRackCount: number;
   racksDisconnected: number;
   racksDegraded: number;
   averageBandwidth: number;
@@ -133,14 +121,12 @@ export interface DCNetworkSummary {
 }
 
 export interface CampusNetworkSummary {
-  switchIds: string[];
   totalT4: number;
   healthyT4: number;
   crossDCBandwidth: number;
 }
 
 export interface ClusterNetworkSummary {
-  switchIds: string[];
   totalT5: number;
   healthyT5: number;
   crossCampusBandwidth: number;
@@ -262,7 +248,6 @@ export interface ClusterCostConfig {
 
 export interface InfrastructureState {
   clusters: Cluster[];
-  switchRegistry: Record<string, NetworkSwitch>;
   totalFlops: number;
   totalTrainingFlops: number;
   totalInferenceFlops: number;
@@ -276,7 +261,6 @@ export interface InfrastructureState {
 
 export const INITIAL_INFRASTRUCTURE: InfrastructureState = {
   clusters: [],
-  switchRegistry: {},
   totalFlops: 0,
   totalTrainingFlops: 0,
   totalInferenceFlops: 0,