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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>