feat(ci): add GitHub Actions CI workflow

- Run tests on push and PR to main
- Build project and upload artifacts
- Use Bun for fast JavaScript runtime

This ensures code quality and prevents regressions.

.github/workflows/ci.yml

@@ -0,0 +1,36 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: latest
+      
+      - name: Install dependencies
+        run: bun install
+        
+      - name: Run tests
+        run: bun test
+        
+      - name: Build
+        run: bun run build
+        
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: impeccable-dist
+          path: dist/
+          retention-days: 7