feat: Terraform Foundation - AWS Landing Zone

Enterprise-grade multi-tenant AWS cloud foundation.

Modules:
- GitHub OIDC for keyless CI/CD authentication
- IAM account settings and security baseline
- AWS Config Rules for compliance
- ABAC (Attribute-Based Access Control)
- SCPs (Service Control Policies)

Features:
- Multi-account architecture
- Cost optimization patterns
- Security best practices
- Comprehensive documentation

Tech: Terraform, AWS Organizations, IAM Identity Center

terraform/03-platform/terraform.tfvars.example

@@ -0,0 +1,15 @@
+# Example variables for 03-platform layer
+# Copy to terraform.tfvars and update values
+
+state_bucket  = "myproject-terraform-state"
+project_name  = "myproject"
+region        = "us-east-1"
+
+# Enable/disable CI/CD resources
+enable_cicd = true
+
+# ECR repositories to create
+ecr_repos = ["base", "app", "worker"]
+
+# Image retention (number of images to keep per repo)
+ecr_image_retention_count = 30