ci: add comprehensive CI workflow with test automation

- Add CI workflow that runs on pushes to master and PR events
- Include PR synchronization trigger as requested
- Run linting, type checking, tests, and build steps
- Use Bun setup consistent with existing release workflow
- Fix branch name to use 'master' instead of 'main'

Author: ericc-ch

.github/workflows/ci.yml

@@ -0,0 +1,32 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: oven-sh/setup-bun@v2
+        with:
+          bun-version: latest
+
+      - name: Install dependencies
+        run: bun install
+
+      - name: Run linter
+        run: bun run lint
+
+      - name: Run type check
+        run: bun run typecheck
+
+      - name: Run tests
+        run: bun test
+
+      - name: Build
+        run: bun run build