Playing with F4, the operator hit VS Code's default "Reply…" box on a
proposal thread: no submit command is wired for cowriting.proposals, so
typed text had nowhere to go. Proposals are decide-only (accept/reject in
the title bar); discussion belongs in a coauthoring thread. Set
canReply=false so the dead input never renders, and expose canReply on the
test-facing RenderedProposal with an E2E assertion.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Ben Stull