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.

modules/encapi/variables.tf

@@ -0,0 +1,37 @@
+variable "statuses" {
+  description = <<EOT
+Map of encapi statuses (Puppet environments) to seed. Keyed by status name.
+Each value may carry an optional description.
+EOT
+  type = map(object({
+    description = optional(string)
+  }))
+  default = {}
+}
+
+variable "roles" {
+  description = <<EOT
+Map of encapi roles to seed. Keyed by role class name (e.g. roles::base).
+Each value may carry an optional description and a default_params object that
+is jsonencode()'d into the role's inheritable defaults.
+EOT
+  type = map(object({
+    description    = optional(string)
+    default_params = optional(any)
+  }))
+  default = {}
+}
+
+variable "nodes" {
+  description = <<EOT
+Map of encapi node assignments to seed. Keyed by certname. Each value pins the
+node to a role and environment (which must exist as a role/status above), with
+optional per-node params jsonencode()'d into the ENC output.
+EOT
+  type = map(object({
+    role        = string
+    environment = string
+    params      = optional(any)
+  }))
+  default = {}
+}