Add GitHub Actions CI workflow for automated testing and builds

- Runs Go engine tests with race detector on every push/PR
- Runs TypeScript tests for worker-api and indexer
- Builds web app and uploads artifacts
- Builds all Go CLI tools (acb-local, acb-mapgen, acb-worker)

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

.github/workflows/ci.yml

@@ -0,0 +1,106 @@
+name: CI
+
+on:
+  push:
+    branches: [master, main]
+  pull_request:
+    branches: [master, main]
+
+jobs:
+  # Go engine tests
+  go-tests:
+    name: Go Tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.22'
+          cache: true
+
+      - name: Run engine tests
+        run: go test ./engine/... -v -race
+
+      - name: Build CLI tools
+        run: |
+          go build ./cmd/acb-local
+          go build ./cmd/acb-mapgen
+          go build ./cmd/acb-worker
+
+  # Worker API tests
+  worker-api-tests:
+    name: Worker API Tests
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: worker-api
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+          cache-dependency-path: worker-api/package-lock.json
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm test
+
+  # Indexer tests
+  indexer-tests:
+    name: Indexer Tests
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: cmd/acb-indexer
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+          cache-dependency-path: cmd/acb-indexer/package-lock.json
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm test
+
+  # Web build
+  web-build:
+    name: Web Build
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: web
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+          cache-dependency-path: web/package-lock.json
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build
+        run: npm run build
+
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: web-dist
+          path: web/dist/
+          retention-days: 7

PROGRESS.md

@@ -7,6 +7,11 @@
 **Last Updated: 2026-03-24**
 
 ### Recent Changes (2026-03-24)
+- Added GitHub Actions CI workflow (`.github/workflows/ci.yml`)
+  - Runs Go engine tests with race detector
+  - Runs TypeScript tests for worker-api and indexer
+  - Builds web app and uploads artifacts
+  - Builds all Go CLI tools
 - Added `README.md` with project overview and quick start guide
 - Added `.gitignore` for proper repository hygiene
 - Added `package-lock.json` files for reproducible builds
@@ -45,6 +50,12 @@
   - `/health` - Liveness probe (always returns 200)
   - `/ready` - Readiness probe (checks database connectivity, returns 503 if unavailable)
   - Documented in DEPLOYMENT.md
+- [x] GitHub Actions CI workflow
+  - `.github/workflows/ci.yml` for automated testing
+  - Go tests with race detector
+  - TypeScript tests for worker-api and indexer
+  - Web build verification
+  - Go binary builds
 
 ### Remaining Phase 6 Work (requires Cloudflare account access)
 
@@ -118,6 +129,9 @@ ai-code-battle/
 ├── DEPLOYMENT.md             # Deployment guide
 ├── docker-compose.bots.yml   # Bot-host orchestration
 ├── docker-compose.workers.yml # Worker orchestration
+├── .github/
+│   └── workflows/
+│       └── ci.yml            # GitHub Actions CI workflow
 ├── engine/
 │   ├── types.go        # Core data types
 │   ├── grid.go         # Toroidal grid implementation