docs(spikes): OpenWorkflow and Pi SDK compatibility spikes + ADR-002/003 (W0-B)

Co-Authored-By: Claude Fable 5.1 <[email protected]>

spikes/openworkflow/worker.ts

@@ -0,0 +1,8 @@
+import { makeClient, initBiz, TAG, WF_VERSION } from "./common.ts";
+await initBiz();
+const { ow } = await makeClient();
+const worker = ow.newWorker({ concurrency: Number(process.env.CONCURRENCY ?? 4) });
+await worker.start();
+if (process.env.PIDFILE) (await import("node:fs")).writeFileSync(process.env.PIDFILE, String(process.pid));
+console.log(`[${TAG}] worker started pid=${process.pid} version=${WF_VERSION}`);
+process.on("SIGTERM", async () => { await worker.stop(); process.exit(0); });