fix(executor): isolated-vm worker pool to prevent single-worker bottleneck

Author: waleedlatif1

apps/sim/lib/core/config/env.ts

@@ -180,6 +180,13 @@ export const env = createEnv({
     EXECUTION_TIMEOUT_ASYNC_TEAM:          z.string().optional().default('5400'),  // 90 minutes
     EXECUTION_TIMEOUT_ASYNC_ENTERPRISE:    z.string().optional().default('5400'),  // 90 minutes
 
+    // Isolated-VM Worker Pool Configuration
+    IVM_POOL_SIZE:                         z.string().optional().default('4'),      // Max worker processes in pool
+    IVM_MAX_CONCURRENT:                    z.string().optional().default('10000'),  // Max concurrent executions globally
+    IVM_MAX_PER_WORKER:                    z.string().optional().default('2500'),   // Max concurrent executions per worker
+    IVM_WORKER_IDLE_TIMEOUT_MS:            z.string().optional().default('60000'),  // Worker idle cleanup timeout (ms)
+    IVM_QUEUE_TIMEOUT_MS:                  z.string().optional().default('300000'), // Max queue wait before rejection (ms)
+
     // Knowledge Base Processing Configuration - Shared across all processing methods
     KB_CONFIG_MAX_DURATION:                z.number().optional().default(600),     // Max processing duration in seconds (10 minutes)
     KB_CONFIG_MAX_ATTEMPTS:                z.number().optional().default(3),       // Max retry attempts