US-2: ECS Fargate Module

[nnthanh101]

As an application developer deploying containerized services,
I want a Terraform module that creates ECS Fargate clusters with CPS 234 security and FOCUS 1.3 cost tags,
So that I can deploy production workloads meeting ANZ regulatory requirements.

Acceptance Criteria:

• terraform validate PASSED
• .tftest.hcl tests PASSED (>=3: basic cluster, service with ALB, Fargate Spot)
• Checkov scan: zero HIGH/CRITICAL
• Infracost estimate in PR comment
• FOCUS 1.3 tags on all resources
• Fargate Spot cost optimization (up to 70% savings)
• Container Insights enhanced monitoring enabled

INVEST Score: I=5 N=4 V=5 E=4 S=3 T=5 = 26/30