[upstream-sync] Port upstream PR #664: register sessions before RPC + :on-event handler#50

github-actions[bot] wants to merge 1 commit intomaincopilot-community-sdk/copilot-sdk-clojure:mainfrom

upstream-sync/2026-03-10-3fced916d8172bf6copilot-community-sdk/copilot-sdk-clojure:upstream-sync/2026-03-10-3fced916d8172bf6Copy head branch name to clipboard