Add repo-level MCP configuration and Copilot instructions

.github/copilot-instructions.md

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+# Repository instructions
+
+- Follow the existing project style and conventions in this repository.
+- Prefer the smallest, clearest change that solves the task.
+- Reuse existing patterns and utilities before introducing new abstractions.
+- Keep pull requests focused on one change or issue at a time.
+- Add or update tests when behavior changes or bugs are fixed.
+- Preserve accessibility, documentation quality, and user-facing clarity.
+- Avoid leaking secrets, credentials, or tokens into code or config files.
+- When working with external services, document required environment variables and setup steps.
+- Prefer readable, maintainable code over clever or overly condensed implementations.

.vscode/mcp.json

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+{
+  "servers": {
+    "filesystem": {
+      "type": "stdio",
+      "command": "npx",
+      "args": [
+        "-y",
+        "@modelcontextprotocol/server-filesystem",
+        "${workspaceFolder}"
+      ]
+    },
+    "github": {
+      "type": "stdio",
+      "command": "npx",
+      "args": [
+        "-y",
+        "@modelcontextprotocol/server-github"
+      ],
+      "env": {
+        "GITHUB_PERSONAL_ACCESS_TOKEN": "${env:GITHUB_TOKEN}"
+      }
+    }
+  }
+}