Add pull request branch info to linked task comments

PR links buried in task comments leave your engineers without branch context for the linked task. This posts branch info to the task so reviewers see context immediately and avoid lookup delays.

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Overview

When PR links only live in comments, reviewers waste time hunting for branch context. This captures the PR number, fetches the pull request, and posts the branch into the linked task so engineers and reviewers get context immediately, reducing lookup time within minutes.