feat: add Temporal-backed TaskTree service

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

cmd/hwlab-tasktree-api/main.ts

@@ -0,0 +1,20 @@
+#!/usr/bin/env bun
+import { createTaskTreeDispatcher } from "../../internal/tasktree/dispatcher.ts";
+import { createTaskTreeHttpApp } from "../../internal/tasktree/http.ts";
+import { taskTreeRuntime } from "../../internal/tasktree/runtime.ts";
+
+const runtime = taskTreeRuntime();
+const dispatch = createTaskTreeDispatcher(runtime);
+const app = createTaskTreeHttpApp({ dispatch, close: () => runtime.store.close() });
+const host = process.env.TASKTREE_API_HOST || "0.0.0.0";
+const port = Number.parseInt(process.env.TASKTREE_API_PORT || process.env.PORT || "6673", 10);
+const server = Bun.serve({ hostname: host, port, fetch: (request) => app.fetch(request) });
+
+process.stdout.write(`${JSON.stringify({ serviceId: "hwlab-tasktree-api", status: "listening", host, port: server.port })}\n`);
+for (const signal of ["SIGINT", "SIGTERM"] as const) {
+  process.once(signal, async () => {
+    server.stop(true);
+    await app.close();
+    process.exit(0);
+  });
+}