Initial commit: GitOps Starter Pack

A teaching-first, single-cluster GitOps setup: Talos Linux + Argo CD with
an app-of-apps layout, MetalLB pre-installed for real LoadBalancer IPs on
bare metal, a demo app, and a progressive docs/ walkthrough with a
CLAUDE.md tutor persona and guided bootstrap checklist.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

apps/demo/namespace.yaml

@@ -0,0 +1,13 @@
+# A Namespace is a way to group related resources together inside the
+# cluster, like a folder. It doesn't do much on its own — its real job is
+# letting you keep "demo" separate from other apps you add later, so you can
+# manage, view, and delete them independently (e.g. `kubectl -n demo get pods`).
+#
+# We create this explicitly, as its own file, rather than letting Argo CD
+# invent it implicitly. That way it shows up in Git like everything else —
+# if you ever wonder "why does this namespace exist?", the answer is always
+# "because a file in this repo says so."
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: demo