Add rack decommission pipeline stage

Racks can now be marked for decommission from the DC view. The rack
leaves production immediately (freeing slot and power), enters the
pipeline as a timed decommission order, and is removed when complete.

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

apps/web/src/store/index.ts

@@ -51,6 +51,7 @@ interface Actions {
   setTrainingAllocation: (ratio: number) => void;
   buildDataCenter: (name: string, location: LocationId, tier: DCTier) => void;
   orderRack: (dataCenterId: string, skuId: RackSkuId) => void;
+  decommissionRack: (dataCenterId: string, rackId: string) => void;
   upgradeDataCenter: (dataCenterId: string, upgrade: 'cooling' | 'redundancy') => void;
   startTraining: (job: Omit<TrainingJob, 'progressTicks'>) => void;
   deployModel: (modelId: string) => void;
@@ -196,10 +197,9 @@ export const useGameStore = create<Store>()(
         if (!dc || dc.status !== 'operational') return s;
 
         const tierConfig = DC_TIER_CONFIGS[dc.tier];
-        const pipelineForDc = s.infrastructure.rackPipeline.filter(o => o.dataCenterId === dataCenterId).length;
-        const actualUsedSlots = dc.racks.length + pipelineForDc;
-        const pipelinePowerForDc = s.infrastructure.rackPipeline
-          .filter(o => o.dataCenterId === dataCenterId)
+        const activePipeline = s.infrastructure.rackPipeline.filter(o => o.dataCenterId === dataCenterId && o.stage !== 'decommission');
+        const actualUsedSlots = dc.racks.length + activePipeline.length;
+        const pipelinePowerForDc = activePipeline
           .reduce((sum, o) => sum + RACK_SKU_CONFIGS[o.skuId].powerDrawKW, 0);
         const actualUsedPower = dc.racks.reduce((sum, r) => sum + RACK_SKU_CONFIGS[r.skuId].powerDrawKW, 0) + pipelinePowerForDc;
         if (actualUsedSlots >= tierConfig.rackSlots) return s;
@@ -225,6 +225,39 @@ export const useGameStore = create<Store>()(
         };
       }),
 
+      decommissionRack: (dataCenterId, rackId) => set((s) => {
+        const dc = s.infrastructure.dataCenters.find(d => d.id === dataCenterId);
+        if (!dc || dc.status !== 'operational') return s;
+
+        const rack = dc.racks.find(r => r.id === rackId);
+        if (!rack) return s;
+
+        const sku = RACK_SKU_CONFIGS[rack.skuId];
+        const dataCenters = s.infrastructure.dataCenters.map(d => {
+          if (d.id !== dataCenterId) return d;
+          return { ...d, racks: d.racks.filter(r => r.id !== rackId) };
+        });
+
+        const order = {
+          id: rackId,
+          skuId: rack.skuId,
+          dataCenterId,
+          stage: 'decommission' as const,
+          stageProgress: 0,
+          stageTotal: sku.pipelineTimeTicks.installation,
+          totalCost: 0,
+          repairCount: 0,
+        };
+
+        return {
+          infrastructure: {
+            ...s.infrastructure,
+            dataCenters,
+            rackPipeline: [...s.infrastructure.rackPipeline, order],
+          },
+        };
+      }),
+
       upgradeDataCenter: (dataCenterId, upgrade) => set((s) => {
         const dc = s.infrastructure.dataCenters.find(d => d.id === dataCenterId);
         if (!dc || dc.status !== 'operational') return s;