The ui.set table row is one long line; #412 (PR #656) also edits it, so
the two PRs conflicted with each other in docs/control-protocol.md
whichever merged second. The thumbnails parameter is now described in
its own paragraph below the table, leaving that row untouched.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>