# l1-ecr — ECR repository primitive

An L1 module for an ECR repository that hosts the ECS task image.
Single-purpose, substrate-agnostic (the IR type is
`aws:ecr:repository`, not a Terraform resource type).

## Interface (the IR-typed contract)

See `interface.json`: inputs `name` + `region` (strings), outputs
`repository_url` (string) + `repository_arn` (arn), 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:ecr:repository` | `resource "aws_ecr_repository" "<id>" { ... }` |
| `resource.inputs.name` | `name = <value>` arg |
| `resource.inputs.region` | `provider "aws" { region = <value> }` |
| `resource.outputs.repository_url` | `output "repository_url" { value = aws_ecr_repository.<id>.repository_url }` |
| `resource.outputs.repository_arn` | `output "repository_arn" { value = aws_ecr_repository.<id>.arn }` |

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.