Add link understanding tool support (#1637)

* Add

* Fix

---------

Co-authored-by: Richard <dasilva333@DESKTOP-74E3GJO.localdomain>

src/link-understanding/index.ts

@@ -0,0 +1,4 @@
+export { applyLinkUnderstanding } from "./apply.js";
+export { extractLinksFromMessage } from "./detect.js";
+export { formatLinkUnderstandingBody } from "./format.js";
+export { runLinkUnderstanding } from "./runner.js";