fix: resolve MCP sidecar image failures (issue #40)

Three fixes for broken MCP sidecars:

1. Remove GitHub MCP sidecar entirely - the upstream image
   (ghcr.io/modelcontextprotocol/servers/github) is discontinued.
   GitHub MCP is now accessed via Copilot API instead.

2. Fix Playwright MCP image - changed from non-existent
   microsoft/playwright-mcp to mcr.microsoft.com/playwright/mcp
   (the official Microsoft Container Registry image).

3. Fix pgtuner MCP startup command - changed --transport to --mode
   and added --host 0.0.0.0 to match the current pgtuner_mcp CLI.

Bumps chart version to 0.3.3.

Closes #40

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: 0.3.2
+version: 0.3.3
 appVersion: "latest"

chart/templates/deployment.yaml

@@ -200,43 +200,11 @@ spec:
           resources:
             {{- toYaml .Values.mcp.sidecars.homeassistant.resources | nindent 12 }}
         {{- end }}
-        {{- if .Values.mcp.sidecars.github.enabled }}
-        - name: github-mcp
-          image: "{{ .Values.mcp.sidecars.github.image.repository }}:{{ .Values.mcp.sidecars.github.image.tag }}"
-          imagePullPolicy: Always
-          args:
-            - --sse
-            - --port={{ .Values.mcp.sidecars.github.port }}
-          ports:
-            - name: github
-              containerPort: {{ .Values.mcp.sidecars.github.port }}
-          env:
-            - name: GITHUB_PERSONAL_ACCESS_TOKEN
-              valueFrom:
-                secretKeyRef:
-                  name: {{ include "antigravity.envSecretName" . }}
-                  key: GITHUB_TOKEN
-                  optional: true
-          livenessProbe:
-            httpGet:
-              path: /health
-              port: {{ .Values.mcp.sidecars.github.port }}
-            initialDelaySeconds: 10
-            periodSeconds: 10
-          readinessProbe:
-            httpGet:
-              path: /health
-              port: {{ .Values.mcp.sidecars.github.port }}
-            initialDelaySeconds: 5
-            periodSeconds: 5
-          resources:
-            {{- toYaml .Values.mcp.sidecars.github.resources | nindent 12 }}
-        {{- end }}
         {{- if .Values.mcp.sidecars.pgtuner.enabled }}
         - name: pgtuner-mcp
           image: "{{ .Values.mcp.sidecars.pgtuner.image.repository }}:{{ .Values.mcp.sidecars.pgtuner.image.tag }}"
           imagePullPolicy: Always
-          command: ["python", "-m", "pgtuner_mcp", "--transport", "sse", "--port", "{{ .Values.mcp.sidecars.pgtuner.port }}"]
+          command: ["python", "-m", "pgtuner_mcp", "--mode", "sse", "--host", "0.0.0.0", "--port", "{{ .Values.mcp.sidecars.pgtuner.port }}"]
           ports:
             - name: pgtuner
               containerPort: {{ .Values.mcp.sidecars.pgtuner.port }}

chart/values.schema.json

@@ -177,9 +177,6 @@
             "homeassistant": {
               "$ref": "#/$defs/mcpSidecar"
             },
-            "github": {
-              "$ref": "#/$defs/mcpSidecar"
-            },
             "pgtuner": {
               "$ref": "#/$defs/mcpSidecar"
             },

chart/values.yaml

@@ -123,21 +123,6 @@ mcp:
           memory: "256Mi"
           cpu: "500m"
 
-    # GitHub API access (DISABLED: archived image)
-    github:
-      enabled: false
-      image:
-        repository: ghcr.io/modelcontextprotocol/servers/github
-        tag: latest
-      port: 8088
-      resources:
-        requests:
-          memory: "64Mi"
-          cpu: "50m"
-        limits:
-          memory: "256Mi"
-          cpu: "500m"
-
     # PostgreSQL performance tuning
     pgtuner:
       enabled: false  # Requires DATABASE_URI in secrets
@@ -157,7 +142,7 @@ mcp:
     playwright:
       enabled: true
       image:
-        repository: microsoft/playwright-mcp
+        repository: mcr.microsoft.com/playwright/mcp
         tag: latest
       port: 8086
       resources: