feat: add Temporal-backed TaskTree service

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

cmd/hwlab-tasktree-worker/main.ts

@@ -0,0 +1,39 @@
+#!/usr/bin/env bun
+import { NativeConnection, Worker } from "@temporalio/worker";
+import path from "node:path";
+
+import { createTaskTreeActivities } from "../../internal/tasktree/activities.ts";
+import { taskTreeRuntime } from "../../internal/tasktree/runtime.ts";
+
+const runtime = taskTreeRuntime();
+if (!runtime.temporalAddress) throw new Error("TASKTREE_TEMPORAL_ADDRESS is required");
+await runtime.store.ensureSchema();
+const connection = await NativeConnection.connect({ address: runtime.temporalAddress });
+const worker = await Worker.create({
+  connection,
+  namespace: runtime.temporalNamespace,
+  taskQueue: runtime.taskQueue,
+  workflowsPath: path.resolve(import.meta.dir, "../../internal/tasktree/workflows.ts"),
+  activities: createTaskTreeActivities(runtime.store)
+});
+const healthPort = Number.parseInt(process.env.TASKTREE_WORKER_HEALTH_PORT || "6674", 10);
+const health = Bun.serve({
+  hostname: process.env.TASKTREE_WORKER_HEALTH_HOST || "0.0.0.0",
+  port: healthPort,
+  fetch(request) {
+    const pathname = new URL(request.url).pathname;
+    if (pathname !== "/health/live" && pathname !== "/health/ready") return Response.json({ ok: false, error: "not_found" }, { status: 404 });
+    return Response.json({ ok: true, serviceId: "hwlab-tasktree-worker", namespace: runtime.temporalNamespace, taskQueue: runtime.taskQueue });
+  }
+});
+
+process.stdout.write(`${JSON.stringify({ serviceId: "hwlab-tasktree-worker", status: "started", namespace: runtime.temporalNamespace, taskQueue: runtime.taskQueue })}\n`);
+for (const signal of ["SIGINT", "SIGTERM"] as const) process.once(signal, () => worker.shutdown());
+try {
+  await worker.run();
+} finally {
+  health.stop(true);
+  await connection.close();
+  await runtime.store.close();
+  process.stdout.write(`${JSON.stringify({ serviceId: "hwlab-tasktree-worker", status: "stopped" })}\n`);
+}