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/server.ts

@@ -0,0 +1,24 @@
+import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js'
+import type { SceneBridge } from './bridge/scene-bridge'
+import { registerPrompts } from './prompts'
+import { registerResources } from './resources'
+import { registerTools } from './tools'
+import { registerVisionTools } from './tools/vision'
+
+export type CreatePascalMcpServerOptions = {
+  bridge: SceneBridge
+  name?: string
+  version?: string
+}
+
+export function createPascalMcpServer(opts: CreatePascalMcpServerOptions): McpServer {
+  const server = new McpServer({
+    name: opts.name ?? 'pascal-mcp',
+    version: opts.version ?? '0.1.0',
+  })
+  registerTools(server, opts.bridge)
+  registerVisionTools(server, opts.bridge)
+  registerResources(server, opts.bridge)
+  registerPrompts(server, opts.bridge)
+  return server
+}