chore: add CI workflow and test badge

.github/workflows/ci.yml

@@ -0,0 +1,11 @@
+name: CI
+
+on:
+  push:
+    branches: ['**']
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    uses: ./.github/workflows/test.yml

.github/workflows/test.yml

@@ -0,0 +1,29 @@
+name: Test
+
+on:
+  workflow_call:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 24
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: TypeScript typecheck
+        run: npm run typecheck
+
+      - name: Run build
+        run: npm run build
+
+      - name: Run tests
+        run: npm run test:coverage

README.md

@@ -1,6 +1,7 @@
 # Class Sync
 Discord bot for syncing course deadlines across class channels and forums. Features automatic reminders, role-based cohort organization, and per-guild data isolation.
 
+[![CI](https://github.com/masonlet/class-sync/actions/workflows/ci.yml/badge.svg)](https://github.com/masonlet/class-sync/actions/workflows/ci.yml)
 [![Privacy Policy](https://img.shields.io/badge/Privacy-Policy-blue)](https://github.com/masonlet/class-sync-legal/blob/main/privacy.md)
 [![Terms of Service](https://img.shields.io/badge/Terms-of%20Service-blue)](https://github.com/masonlet/class-sync-legal/blob/main/tos.md)
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](./LICENSE)

package.json

@@ -5,6 +5,7 @@
   "main": "dist/src/index.js",
   "type": "module",
   "scripts": {
+    "typecheck": "tsc",
     "build": "tsc -p tsconfig.build.json",
     "deploy": "npm run build && node dist/deploy-commands.js",
     "start": "npm run build && node dist/src/index.js",