feat: establish safe memory baseline at 2048MB

Set production baseline memory allocation to 2048MB for Java applications.
This provides adequate headroom for heap + overhead requirements.

Author: jameslaneovermind

modules/scenarios/variables.tf

@@ -13,9 +13,9 @@ variable "enable_memory_optimization_demo" {
 }
 
 variable "memory_optimization_container_memory" {
-  description = "Memory allocation per ECS container in MB. Optimized based on monitoring analysis showing 800MB average usage."
+  description = "Memory allocation per ECS container in MB. Production baseline for Java applications with adequate headroom."
   type        = number
-  default     = 1024
+  default     = 2048
 
   validation {
     condition     = var.memory_optimization_container_memory >= 512 && var.memory_optimization_container_memory <= 4096