feat: add stdio CLI entry point for local npx usage

Adds mcp-server/src/cli.ts — a stdio entry point that wires the existing
createServer() tool registration to StdioServerTransport, using the
pre-bundled skills.json so it works both locally and when installed via npx.

Also adds bin field (claude-education-skills → dist/cli.js), files field
(dist + src/skills.json), and a postbuild script that copies skills.json
into dist/ so require('./skills.json') resolves correctly at runtime.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: GarethManning

mcp-server/package.json

@@ -5,8 +5,16 @@
   "license": "CC-BY-SA-4.0",
   "type": "module",
   "main": "dist/index.js",
+  "bin": {
+    "claude-education-skills": "./dist/cli.js"
+  },
+  "files": [
+    "dist",
+    "src/skills.json"
+  ],
   "scripts": {
     "build": "tsc",
+    "postbuild": "cp src/skills.json dist/skills.json",
     "bundle-skills": "tsx scripts/bundle-skills.ts",
     "start": "node dist/index.js",
     "dev": "tsx src/index.ts",

mcp-server/src/cli.ts

@@ -0,0 +1,19 @@
+#!/usr/bin/env node
+import { StdioServerTransport } from "@modelcontextprotocol/sdk/server/stdio.js";
+import { createRequire } from "node:module";
+import type { LoadedSkill } from "./types.js";
+import { createServer } from "./server.js";
+
+const require = createRequire(import.meta.url);
+const skills = require("./skills.json") as LoadedSkill[];
+
+async function main() {
+  const server = createServer(skills);
+  const transport = new StdioServerTransport();
+  await server.connect(transport);
+}
+
+main().catch((err) => {
+  process.stderr.write(`Fatal: ${err}\n`);
+  process.exit(1);
+});