fix(cursor): persist resume id early and return 409 for resume_unavailable (#745)

Remote cursor launcher now mirrors local launcher by writing cursorSessionId
to hub metadata as soon as --resume is known, before the agent init event.
POST /sessions/:id/resume maps resume_unavailable to 409 with clearer guidance.

Fixes tiann/hapi#744

Co-authored-by: Cursor <cursoragent@cursor.com>

cli/src/cursor/cursorRemoteLauncher.ts

@@ -82,6 +82,9 @@ class CursorRemoteLauncher extends RemoteLauncherBase {
         };
 
         let cursorSessionId: string | null = session.sessionId;
+        if (cursorSessionId) {
+            session.onSessionFound(cursorSessionId);
+        }
 
         while (!this.shouldExit) {
             const waitSignal = this.abortController.signal;