Notify reviewers in team chat for requested PRs

Your code review requests land in the PR feed without clear ownership, causing merge delays. You receive threaded team chat notices that mention reviewers so reviews begin same day.

Overview

Unacknowledged review requests stall merges and extend incident windows. This flow surfaces review requests into your team chat, mentions the assigned reviewer, and threads the PR link so reviews begin within hours and merges unblock before releases.