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/.copier/questionnaire/0100-template.yml

@@ -0,0 +1,18 @@
+template_metadata:
+  type: yaml
+  help: "Generic template metadata used by naming and rendering hooks"
+  default: |
+    domain: demo
+    project: sample-product
+
+features:
+  type: yaml
+  help: "Feature/module matrix for template rendering"
+  default: |
+    modules:
+      is_enabled: true
+      instances:
+        - name: users
+          version: 1.0.0
+        - name: billing
+          version: 1.0.0