feat(agent-pod): deploy pi coding-agent pod for in-cluster harness

Namespace + Deployment (2-4 CPU, 4-8Gi mem) running node:20-slim with
pi installed at startup, wired to the homelab-ornith/reasoning/qwen
model providers via the existing model-invoke-apikey. Placeholder
node:20-slim image for now, real harness image to follow.

k8s/argocd/apps/60-applications.yaml

@@ -84,6 +84,29 @@ spec:
     syncOptions:
       - CreateNamespace=true
 ---
+apiVersion: argoproj.io/v1alpha1
+kind: Application
+metadata:
+  name: agent-pod
+  namespace: argocd
+  annotations:
+    argocd.argoproj.io/sync-wave: "8"
+spec:
+  project: homelab
+  source:
+    repoURL: https://github.com/Riotpiaole/riotpiao.homelab.com.git
+    targetRevision: main
+    path: k8s/apps/agent-pod
+  destination:
+    server: https://kubernetes.default.svc
+    namespace: agent-pod
+  syncPolicy:
+    automated:
+      prune: true
+      selfHeal: true
+    syncOptions:
+      - CreateNamespace=true
+---
 # iMessage/SMS delivery. Raw manifests: a privileged macOS VM (Docker-OSX)
 # running the BlueBubbles server, plus its dedicated local StorageClass.
 #