feat(docs): IaC tooling decision page — OpenTofu canonical, Terragrunt phase-out#56
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…runt phase-out Records the org's IaC tooling stance: OpenTofu is the canonical engine (every active repo already runs tofu), the terraform-* repo prefix is legacy and not worth renaming, and Terragrunt is kept only where it does real work (SOPS decrypt, 3-layer input merge, after_hook Ansible sync) and phased out where it is a thin backend/provider wrapper that OpenTofu 1.8+ native config now covers. Also fixes stale 'Terraform' engine references in infrastructure/overview (prose, mermaid node, SOPS card) and cross-links the new page from terraform-check-placement. Refs: dryvist/docs-starlight (engine-prose + phase-out asides PR) Assisted-by: Claude:claude-opus-4-8
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What
Adds
infrastructure/iac-tooling.mdx— the decision record for two recurring questions: Terraform or OpenTofu? and do we need Terragrunt?Why
The premise was already half-resolved on investigation:
opentofu/setup-opentofu, lockfiles pinregistry.opentofu.org/*, the Nix dev shell marksopentofu # canonical binary. "Terraform" survives only interraform-*repo names and stale doc prose.after_hookAnsible sync); elsewhere it only generates a backend/provider block that OpenTofu 1.8+ native config now covers. Nodependency/run-all/stacks/multi-account anywhere.Decisions recorded
terraform-*names are legacy — documented, not renamed (modulesourcerefs, redirects, CI, and doc-link churn aren't worth it; same logic as the JacobPEvans→dryvist redirect rule). New repos usetofu-*.Also
infrastructure/overview.mdx(blockquote, description, mermaid node, caption, SOPS card).terraform-check-placement.mdx.Out of scope (follow-ups)
terraform-github/terraform-runs-on/terraform-aws— code work in those repos, to be tracked there.infrastructure/overview.mdxlinksterraform-awsto a repo that is private — pre-existing, not touched here.Verification
jq empty docs.json✓scripts/validate-mermaid.sh✓ (exit 0, new convergence diagram parses)Refs: dryvist/docs-starlight (companion PR for engine-prose + phase-out asides)
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