feat(mcp): finalize scaffolding and factory entry

Adds packages/mcp/.gitignore, src/index.ts (public API barrel),
src/server.ts (createPascalMcpServer factory), and a smoke test
for the public API.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/mcp/src/index.test.ts

@@ -0,0 +1,11 @@
+import { expect, test } from 'bun:test'
+
+test('version module loads', async () => {
+  const mod = await import('./index')
+  expect(mod.version).toBe('0.1.0')
+})
+
+test('createPascalMcpServer is a function', async () => {
+  const mod = await import('./index')
+  expect(typeof mod.createPascalMcpServer).toBe('function')
+})