feat: publish standalone worker

Separate worker packaging and service lifecycle from the control plane.

.github/workflows/ci.yml

@@ -0,0 +1,27 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.26.x'
+          cache: true
+      - name: Check module files
+        run: |
+          go mod tidy
+          git diff --exit-code -- go.mod go.sum
+      - name: Test worker packages
+        run: make test
+      - name: Build binary
+        run: make build