What is a recommended layout for a reusable module?

modules/vpc/
  main.tf
  variables.tf
  outputs.tf
  versions.tf
  README.md
  examples/
    basic/
      main.tf

• main.tf defines resources, data sources, and locals.

• variables.tf contains typed inputs with descriptions and validations.

• outputs.tf exposes the minimal set of outputs downstream stacks need.

• versions.tf pins compatible Terraform and provider versions.

• examples/ hosts runnable samples for documentation and testing, usually referenced by CI.