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/apps/agent-pod/configmap.yaml

@@ -0,0 +1,41 @@
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: pi-config
+  namespace: agent-pod
+data:
+  config.json: |
+    {
+      "autoLoadSkills": [
+        "caveman",
+        "karpathy-guidelines"
+      ],
+      "skillsPath": "~/.pi/skills",
+      "enforceRules": {
+        "karpathyGuidelines": {
+          "enabled": true,
+          "strict": true,
+          "rules": [
+            "Think before coding - surface assumptions and tradeoffs",
+            "Simplicity first - minimum code that solves the problem",
+            "Surgical changes - touch only what you must",
+            "Goal-driven execution - define verifiable success criteria"
+          ]
+        }
+      },
+      "projectSpecific": {
+        "homelab": {
+          "gitOpsOnly": true,
+          "noManualKubectl": true,
+          "rebaseOnly": true,
+          "cnpgPattern": "unified-app-user"
+        }
+      }
+    }
+  settings.json: |
+    {
+      "defaultModel": "qwen2.5:3b-instruct",
+      "defaultProvider": "homelab-qwen",
+      "defaultThinkingLevel": "medium",
+      "theme": "light"
+    }