ci: add GitHub Actions workflow with Codecov

Runs tests for brain, monitor, and agentic packages on push to main.

Co-Authored-By: Virgil <virgil@lethean.io>

.github/workflows/ci.yml

@@ -0,0 +1,26 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+
+      - name: Run tests with coverage
+        run: |
+          go test -coverprofile=coverage.out ./pkg/brain/... ./pkg/monitor/... ./pkg/agentic/...
+          sed -i 's|dappco.re/go/agent/||g' coverage.out
+
+      - name: Upload to Codecov
+        uses: codecov/codecov-action@v5
+        with:
+          files: coverage.out
+          token: ${{ secrets.CODECOV_TOKEN }}