- PullRequestDetailPanel takes main's #6039 rework wholesale (reactions,
  update-branch, auto-merge, in-place editing); the thread-details action
  hooks stay in usePullRequestActions with label maps extended for the
  new action variants
- CommandPalette #6330 provider subtitles adapted to the v2 shell
  (session -> runtime for provider instance and display name)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>