Distinguish a reusable IaC module contract from a convenient internal snippet.
Reusable IaC modules are products with callers, not folders with helper code. The contract is wider than variables Module consumers rely on the names and meanings of variables, the shape of outputs, default behavior, provider assumptions, resource addressing, and lifecycle semantics. A change can be technically valid Terraform and still be a contract break if it forces callers into replacement or downtime. SemVer makes risk legible A patch says callers should expect only compatible fixes. A minor says new capability is available without breaking existing callers. A major says callers must review and choose a migration. Version numbers are useful…
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