`tea --add-assignees` posts to /issues/{n}/assignees, which returns 404 on
this Forgejo deployment and makes every `claim` fail. Set the assignee through
the issue PATCH endpoint (full assignees list), which the server accepts, and
reuse `edit_labels` for the status transition. Update the CLI e2e fake `tea`
to model the PATCH assignee call.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WMctdE9E1c8d6UHQWX8rNt