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/metallb/Chart.yaml

@@ -0,0 +1,21 @@
+# An "umbrella" chart: it declares a dependency on the upstream MetalLB
+# chart below, AND carries two templates of its own
+# (apps/metallb/templates/) — the IPAddressPool and L2Advertisement that
+# configure it. Argo CD detects this as a Helm source because a Chart.yaml
+# exists at this path, resolves the dependency, and syncs the combined
+# rendered output as one Application — exactly like any other app in
+# apps/. This is the real, working example of the Helm-based app pattern
+# mentioned in docs/07-adding-new-apps.md: use it as a template if you want
+# to bring in another third-party chart later.
+apiVersion: v2
+name: metallb-app
+description: Installs MetalLB from the upstream chart, for this repo's bare-metal LoadBalancer support
+version: 0.1.0
+dependencies:
+  - name: metallb
+    # A version *range* rather than an exact pin, so this doesn't silently
+    # go stale. For a fully reproducible install, check
+    # https://artifacthub.io/packages/helm/metallb/metallb for the current
+    # release and pin an exact version here instead.
+    version: ">=0.14.3"
+    repository: https://metallb.github.io/metallb