add fixture-invoicing example, sample-room wrap, kind cluster support

- examples/fixture-invoicing/: FastAPI + Vue + Postgres demo (4-entity invoice fixture)
- cfg/sample/: wraps the fixture (managed.repos points at examples/)
- ctrl/kind-{up,down,status}.sh + per-room k8s render in soleprint/ctrl/k8s/
- build.py: relative repo paths, resilient rmtree, optional k8s render hook
- cfg/.gitignore: stop ignoring sample/ and standalone/ template rooms

Manifests render cleanly but kind cluster has not been run end-to-end yet.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

cfg/sample/data/templates.json

@@ -0,0 +1,12 @@
+{
+  "items": [
+    {
+      "name": "feature-form",
+      "slug": "feature-form",
+      "title": "Feature Form Template",
+      "status": "ready",
+      "template_path": "data/template/feature-form",
+      "system": "album"
+    }
+  ]
+}