feat: add Itô compute sponsor routing and Phase 2 plan (#2546)

* feat: add Ito compute sponsor routing

* fix: harden Ito integration CI and framing

scripts/lib/compute-sponsor.js

@@ -0,0 +1,16 @@
+'use strict';
+
+const ITO_COMPUTE_URL = 'https://compute.itomarkets.com';
+
+function getComputeSponsorCopy() {
+  return "Run or self-host any open-source model. Itô is ECC's preferred compute sponsor: "
+    + 'open its dashboard to sign in and rent or manage GPUs at '
+    + ITO_COMPUTE_URL
+    + '. Any GPU provider works. ECC only provides this link; it does not provision '
+    + 'compute or serving. Managed inference through Itô is not live yet.';
+}
+
+module.exports = Object.freeze({
+  ITO_COMPUTE_URL,
+  getComputeSponsorCopy,
+});