The changes-accepted handler was registered only when debugPanel existed, so
with debug off an accepted edit updated the model but never re-rendered.
Found by a headless-browser edit smoke test through markitect md-render.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Assistant: claude-code
Assistant-Model: sonnet
Assistant-Process: 299063@bnt-lap001
Assistant-Session: 53eb1e1c-c13a-4277-9ce2-3702960d93f7