template-engine-copier skill: initial import

Copier + Jinja template-repository design skill: reference architecture,
implementation workflow, validation checklist, and a full worked example
template (questionnaire, extensions, resolvers, wrapper-first .scripts).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

example/.scripts/copier/lib/-bootstrap-one.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+set -e
+
+_copier_bootstrap_one() {
+  [ -z "${HL_V1_COPIER_TARGET_DIR}" ] && {
+    echo "--copier-target-dir is required"
+    return 1
+  }
+
+  _copier_answers_new_ensure_existence
+  _copier_answers_previous_pull_and_merge
+  _copier_answers_params_pull_and_merge
+
+  if [ "${HL_V1_COPIER_FORCE_COPY}" = "true" ]; then
+    copier copy \
+      --trust \
+      --force \
+      --overwrite \
+      --data-file "${HL_V1_COPIER_FILE_COPIER_ANSWERS_NEW}" \
+      . "${HL_V1_COPIER_TARGET_DIR}"
+  else
+    copier copy \
+      --trust \
+      --data-file "${HL_V1_COPIER_FILE_COPIER_ANSWERS_NEW}" \
+      . "${HL_V1_COPIER_TARGET_DIR}"
+  fi
+
+  # Keep template repo CI separate from rendered repo CI, same pattern as source repos.
+  if [ -f "${HL_V1_COPIER_TARGET_DIR}/.tmp-gitlab-ci.yml" ]; then
+    mv "${HL_V1_COPIER_TARGET_DIR}/.tmp-gitlab-ci.yml" "${HL_V1_COPIER_TARGET_DIR}/.gitlab-ci.yml"
+  fi
+}