fix: playwright MCP sidecar startup args (#41)

The Playwright MCP image (mcr.microsoft.com/playwright/mcp) doesn't
support --transport flag. Use node cli.js entrypoint with --headless,
--browser chromium, --no-sandbox, and --port for SSE mode.

Fixes #41

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: Dev Container with AI coding agents and MCP sidecars
 type: application
-version: 0.4.0
+version: 0.4.1
 appVersion: "latest"

chart/templates/deployment.yaml

@@ -238,9 +238,13 @@ spec:
         - name: playwright-mcp
           image: "{{ .Values.mcp.sidecars.playwright.image.repository }}:{{ .Values.mcp.sidecars.playwright.image.tag }}"
           imagePullPolicy: Always
+          command: ["node"]
           args:
-            - --transport
+            - cli.js
-            - sse
+            - --headless
+            - --browser
+            - chromium
+            - --no-sandbox
             - --port
             - {{ .Values.mcp.sidecars.playwright.port | quote }}
           ports: