fix: remove cross-variable validation from worker lists

Terraform variable validation blocks can only reference the variable itself, so list length checks against worker_count were removed to restore init/plan.

terraform/variables.tf

@@ -67,22 +67,12 @@ variable "worker_cores" {
   type        = list(number)
   default     = [4, 4, 3]
   description = "vCPU cores for each worker VM"
-
-  validation {
-    condition     = length(var.worker_cores) == var.worker_count
-    error_message = "worker_cores list length must equal worker_count."
-  }
 }
 
 variable "worker_memory_mb" {
   type        = list(number)
   default     = [12288, 12288, 12288]
   description = "Memory in MB for each worker VM"
-
-  validation {
-    condition     = length(var.worker_memory_mb) == var.worker_count
-    error_message = "worker_memory_mb list length must equal worker_count."
-  }
 }
 
 variable "control_plane_disk_size" {