ci: standardize CI/CD workflows, add release workflow and Renovate

- CI: single sequential job, local-ubuntu-latest runner, Node 22, workflow_call trigger, npm run commands
- Release: new workflow with CI gate, concurrency protection, dynamic package name, tarball validation, gh CLI
- Add artifacthub-pkg.yml for Artifact Hub listing
- Add renovate.json with recommended config

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

artifacthub-pkg.yml

@@ -0,0 +1,31 @@
+version: "0.1.0"
+name: kube-vip
+displayName: kube-vip
+createdAt: "2026-03-04T00:00:00Z"
+description: >-
+  Headlamp plugin for kube-vip virtual IP and load balancer visibility.
+  Monitors kube-vip DaemonSet/pods, LoadBalancer services, nodes, IP pools,
+  and leader election. Read-only — no cluster write operations.
+license: Apache-2.0
+homeURL: https://github.com/privilegedescalation/headlamp-kube-vip-plugin
+keywords:
+  - kube-vip
+  - virtual-ip
+  - load-balancer
+  - headlamp
+  - kubernetes
+links:
+  - name: Source
+    url: https://github.com/privilegedescalation/headlamp-kube-vip-plugin
+  - name: kube-vip
+    url: https://kube-vip.io/
+maintainers:
+  - name: privilegedescalation
+    email: chris@farhood.org
+provider:
+  name: privilegedescalation
+annotations:
+  headlamp/plugin/archive-url: "https://github.com/privilegedescalation/headlamp-kube-vip-plugin/releases/download/v0.1.0/kube-vip-0.1.0.tar.gz"
+  headlamp/plugin/archive-checksum: ""
+  headlamp/plugin/version-compat: ">=0.26"
+  headlamp/plugin/distro-compat: "in-cluster"