MR Comment Handler

Find the open MR for the current branch and address its review threads using glab. Run all glab commands with elevated network access.

Prerequisites

• Ensure glab auth status succeeds (via glab auth login or GITLAB_TOKEN).
• Ensure glab is at least v1.80.4.
• When sandboxing blocks network calls, rerun with sandbox_permissions=require_escalated.
• Sanity check auth up front:

glab auth status