Add Playwright MCP server config (#215)

Adds a project-scoped .mcp.json registering the Playwright MCP server
so browser automation tooling is available to anyone using Claude Code
in this repo.

Co-authored-by: Claude Opus 4.8 (1M context) <[email protected]>

.mcp.json

@@ -0,0 +1,12 @@
+{
+  "mcpServers": {
+    "playwright": {
+      "type": "stdio",
+      "command": "npx",
+      "args": [
+        "@playwright/mcp@latest"
+      ],
+      "env": {}
+    }
+  }
+}