Implement AXIS parity UI and execution baseline

web/react/src/sim-worker-entry.ts

@@ -0,0 +1,22 @@
+import createModule from "../../../build-wasm/linuxcnc-sim-core.js";
+import { SimSession } from "../../worker/sim-session.mjs";
+
+// The boot event is a transport diagnostic; it carries no simulation state.
+self.postMessage({ schema_version: 1, kind: "WORKER_BOOT", context_id: "linuxcnc-2.10.0-pre0-wasm-m1-py-c1", session_id: "boot", seq: 0, payload: { status: "booting", runtime: "react-vite-worker" } });
+let session: SimSession | null = null;
+const queue: MessageEvent[] = [];
+const handle = (event: MessageEvent) => {
+  try {
+    if (!session) { queue.push(event); return; }
+    self.postMessage(session.accept(event.data));
+  } catch (error) {
+    self.postMessage({ schema_version: 1, kind: "ERROR", context_id: session?.contextId ?? "linuxcnc-2.10.0-pre0-wasm-m1-py-c1", session_id: session?.sessionId ?? "boot", seq: event.data?.seq ?? 0, payload: { status: "error", code: "worker_exception", message_key: error instanceof Error ? error.message : String(error), retryable: false } });
+  }
+};
+self.onmessage = handle;
+createModule().then((core) => {
+  session = new SimSession(core);
+  for (const event of queue.splice(0)) handle(event);
+}).catch((error) => {
+  self.postMessage({ schema_version: 1, kind: "ERROR", context_id: "linuxcnc-2.10.0-pre0-wasm-m1-py-c1", session_id: "boot", seq: 0, payload: { status: "error", code: "worker_wasm_init", message_key: error instanceof Error ? error.message : String(error), retryable: false } });
+});