Populate terragrunt-enc: encapi ENC data as code

terragrunt-enc is the single source of truth for encapi ENC data (Puppet
statuses, roles, and node classifications), managed with Terraform/Terragrunt.
It supersedes Cobbler classification for Puppet and the terraform-incus
dual-write prototype (PR #39).

- Add modules/encapi (encapi_status / encapi_role / encapi_node, nodes
  FK-ordered after their role and status).
- Add config/encapi leaf: 3 statuses, 51 roles, and 143 node assignments
  (130 container VMs env production + 13 prodnxsr physicals env develop),
  all YAML-driven.
- Add config/root.hcl (consul backend infra/terraform/enc/<leaf>/state) and
  the encapi provider from the artifactapi registry (v0.1.0).
- Add Makefile, Woodpecker pre-commit/plan/apply pipelines, pre-commit
  config, ci/extract_incus_nodes.py, and expand the README.

Makefile

@@ -0,0 +1,51 @@
+.PHONY: init plan apply apply-if-changes format pre-commit
+
+VAULT_AUTH_METHOD ?= approle
+VAULT_K8S_ROLE ?= woodpecker_terraform_enc
+VAULT_K8S_MOUNT ?= auth/k8s/au/syd1
+VAULT_K8S_JWT_PATH ?= /var/run/secrets/kubernetes.io/serviceaccount/token
+
+define vault_env
+	@export VAULT_ADDR="https://vault.service.consul:8200" && \
+	if [ "$(VAULT_AUTH_METHOD)" = "kubernetes" ]; then \
+		export VAULT_TOKEN=$$(vault write -field=token $(VAULT_K8S_MOUNT)/login role=$(VAULT_K8S_ROLE) jwt=$$(cat $(VAULT_K8S_JWT_PATH))); \
+	else \
+		export VAULT_TOKEN=$$(vault write -field=token auth/approle/login role_id=$$VAULT_ROLEID); \
+	fi && \
+	export CONSUL_HTTP_TOKEN=$$(vault read -field=token consul_root/au/syd1/creds/terraform-enc) && \
+	export ENCAPI_WRITE_TOKEN=$$(vault kv get -field=ENCAPI_WRITE_TOKEN kv/kubernetes/namespace/encapi/default/environment)
+endef
+
+init:
+	@$(call vault_env) && \
+	terragrunt run --all --non-interactive init -- -upgrade
+
+plan: init
+	@$(call vault_env) && \
+	terragrunt run --all --parallelism 4 --non-interactive plan
+
+apply-if-changes: init
+	@$(call vault_env) && \
+	terragrunt run --all --parallelism 4 --non-interactive plan -- -detailed-exitcode -out=tfplan; \
+	EXIT_CODE=$$?; \
+	if [ $$EXIT_CODE -eq 2 ]; then \
+		$(call vault_env) && \
+		terragrunt run --all --parallelism 2 --non-interactive apply -- tfplan; \
+	elif [ $$EXIT_CODE -eq 0 ]; then \
+		echo "No changes detected, skipping apply."; \
+	else \
+		exit $$EXIT_CODE; \
+	fi
+
+apply: init
+	@$(call vault_env) && \
+	terragrunt run --all --parallelism 2 --non-interactive apply
+
+format:
+	@echo "Formatting OpenTofu files..."
+	@tofu fmt -recursive .
+	@echo "Formatting Terragrunt files..."
+	@terragrunt hcl fmt
+
+pre-commit:
+	@uvx pre-commit run --all-files