Implement worker coordination runtime and finish WP-0003

Assistant: codex
Assistant-Model: gpt-6-astra
Assistant-Session: 01a07b5b-ea58-7ad2-bdbb-0b1c995cfc35

.forgejo/workflows/check.yaml

@@ -0,0 +1,12 @@
+name: check
+on: [push, pull_request]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: astral-sh/setup-uv@v6
+        with:
+          version: "0.8.15"
+      - run: uv sync --locked
+      - run: make check