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/veins.json

@@ -0,0 +1,60 @@
+{
+  "items": [
+    {
+      "name": "jira",
+      "slug": "jira",
+      "title": "Jira",
+      "status": "live",
+      "system": "artery"
+    },
+    {
+      "name": "slack",
+      "slug": "slack",
+      "title": "Slack",
+      "status": "building",
+      "system": "artery"
+    },
+    {
+      "name": "google",
+      "slug": "google",
+      "title": "Google",
+      "status": "building",
+      "system": "artery"
+    },
+    {
+      "name": "maps",
+      "slug": "maps",
+      "title": "Maps",
+      "status": "planned",
+      "system": "artery"
+    },
+    {
+      "name": "whatsapp",
+      "slug": "whatsapp",
+      "title": "WhatsApp",
+      "status": "planned",
+      "system": "artery"
+    },
+    {
+      "name": "gnucash",
+      "slug": "gnucash",
+      "title": "GNUCash",
+      "status": "planned",
+      "system": "artery"
+    },
+    {
+      "name": "vpn",
+      "slug": "vpn",
+      "title": "VPN",
+      "status": "planned",
+      "system": "artery"
+    },
+    {
+      "name": "ia",
+      "slug": "ia",
+      "title": "IA",
+      "status": "live",
+      "system": "artery"
+    }
+  ]
+}