Initial import: phase docs, configs, Claude conventions

Phase 1-3 runbooks and design notes, version pins, config templates,
project-history conventions, cluster-inspector read-only credentials setup.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,12 @@
+# credentials & generated kubeconfigs
+.claude/cluster-inspector/kubeconfigs/
+.claude/settings.local.json
+*.kubeconfig
+kubeconfig*
+*secret*
+clusterctl.yaml
+!configs/capi/clusterctl.yaml.example
+.env
+# packer / image-builder output
+packer.log
+*.iso