feat: add Home Assistant MCP sidecar and fix K8s/Flux MCP deployment logic

Added features:
- Home Assistant MCP server as optional sidecar (mcpSidecars.homeassistant)
- Requires homeassistant-url and homeassistant-token secrets
- Runs on port 8087 using SSE transport mode
- Disabled by default due to credential requirements

Fixed deployment logic:
- Kubernetes and Flux MCP sidecars now only deploy when:
  1. They are enabled in values (mcpSidecars.<name>.enabled: true)
  2. AND clusterAccess is not "none" (they need RBAC to function)
- Prevents unnecessary container failures when no permissions exist

Documentation updates:
- Complete Helm values reference for all MCP sidecars
- Deployment examples and troubleshooting guides
- Updated memory notes with current architecture

Breaking change:
- K8s/Flux MCP sidecars won't deploy with clusterAccess=none
- This is intentional as they cannot function without RBAC

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

chart/Chart.yaml

@@ -2,5 +2,5 @@ apiVersion: v2
 name: devcontainer
 description: Antigravity Dev Container with Happy Coder AI assistant
 type: application
-version: 0.1.17
+version: 0.1.18
 appVersion: "latest"

chart/templates/deployment.yaml

@@ -98,7 +98,7 @@ spec:
             initialDelaySeconds: 5
             periodSeconds: 5
           {{- end }}
-        {{- if .Values.mcpSidecars.kubernetes.enabled }}
+        {{- if and .Values.mcpSidecars.kubernetes.enabled (ne .Values.clusterAccess "none") }}
         - name: kubernetes-mcp
           image: "{{ .Values.mcpSidecars.kubernetes.image.repository }}:{{ .Values.mcpSidecars.kubernetes.image.tag }}"
           args:
@@ -123,7 +123,7 @@ spec:
           resources:
             {{- toYaml .Values.mcpSidecars.kubernetes.resources | nindent 12 }}
         {{- end }}
-        {{- if .Values.mcpSidecars.flux.enabled }}
+        {{- if and .Values.mcpSidecars.flux.enabled (ne .Values.clusterAccess "none") }}
         - name: flux-mcp
           image: "{{ .Values.mcpSidecars.flux.image.repository }}:{{ .Values.mcpSidecars.flux.image.tag }}"
           args:
@@ -147,6 +147,40 @@ spec:
           resources:
             {{- toYaml .Values.mcpSidecars.flux.resources | nindent 12 }}
         {{- end }}
+        {{- if .Values.mcpSidecars.homeassistant.enabled }}
+        - name: homeassistant-mcp
+          image: "{{ .Values.mcpSidecars.homeassistant.image.repository }}:{{ .Values.mcpSidecars.homeassistant.image.tag }}"
+          imagePullPolicy: Always
+          command: ["fastmcp", "run", "fastmcp-sse.json"]
+          ports:
+            - name: homeassistant
+              containerPort: {{ .Values.mcpSidecars.homeassistant.port }}
+          env:
+            - name: HOMEASSISTANT_URL
+              valueFrom:
+                secretKeyRef:
+                  name: {{ include "antigravity.envSecretName" . }}
+                  key: homeassistant-url
+                  optional: true
+            - name: HOMEASSISTANT_TOKEN
+              valueFrom:
+                secretKeyRef:
+                  name: {{ include "antigravity.envSecretName" . }}
+                  key: homeassistant-token
+                  optional: true
+          livenessProbe:
+            tcpSocket:
+              port: {{ .Values.mcpSidecars.homeassistant.port }}
+            initialDelaySeconds: 10
+            periodSeconds: 10
+          readinessProbe:
+            tcpSocket:
+              port: {{ .Values.mcpSidecars.homeassistant.port }}
+            initialDelaySeconds: 5
+            periodSeconds: 5
+          resources:
+            {{- toYaml .Values.mcpSidecars.homeassistant.resources | nindent 12 }}
+        {{- end }}
       volumes:
         - name: workspace
           emptyDir: {}

chart/values.yaml

@@ -95,3 +95,16 @@ mcpSidecars:
       limits:
         memory: "256Mi"
         cpu: "500m"
+  homeassistant:
+    enabled: false  # Disabled by default, requires HOMEASSISTANT_URL and HOMEASSISTANT_TOKEN
+    image:
+      repository: ghcr.io/homeassistant-ai/ha-mcp
+      tag: stable
+    port: 8087
+    resources:
+      requests:
+        memory: "64Mi"
+        cpu: "50m"
+      limits:
+        memory: "256Mi"
+        cpu: "500m"