# l1-ecs-cluster — ECS Fargate cluster primitive

An L1 module for an ECS Fargate cluster. Single-purpose,
substrate-agnostic (the IR type is `aws:ecs:cluster`, not a Terraform
resource type).

## Interface (the IR-typed contract)

See `interface.json`: inputs `name` + `region` (strings), outputs
`cluster_arn` (arn) + `cluster_id` (string), no NFRs.

## IR → Terraform mapping (performed by the adapter)

The Terraform adapter (`adapters/terraform/adapter.py`) translates this
L1's IR shape to Terraform:

| IR | Terraform |
|----|-----------|
| `resource.type = aws:ecs:cluster` | `resource "aws_ecs_cluster" "<id>" { ... }` |
| `resource.inputs.name` | `name = <value>` arg |
| `resource.inputs.region` | `provider "aws" { region = <value> }` |
| `resource.outputs.cluster_arn` | `output "cluster_arn" { value = aws_ecs_cluster.<id>.arn }` |
| `resource.outputs.cluster_id` | `output "cluster_id" { value = aws_ecs_cluster.<id>.id }` |

The adapter is a thin layer (ARCHITECTURE.md §12.2); it does not own L1
content — it only translates.

## Versioning (W3.D)

`1.0.0` — interface MAJOR, behavior MINOR, lifecycle PATCH. MAJOR bumps
require a new registry entry (immutable publication); old entries enter
a 12-month deprecation window.