The adapter's send_clarify IS the user-facing rendering of a clarify
prompt (interactive buttons, or the numbered-text fallback). The
gateway's tool-progress callback additionally rendered a progress
bubble for the clarify tool.started event — in verbose mode that
bubble contains the raw tool-call args JSON
({"question": ..., "choices": [...]}), and because the progress
queue drains on a background task, the JSON landed right underneath
the rendered interactive prompt on Slack.
Skip clarify in the progress callback entirely: the prompt rendering
already covers every mode, so a progress line is pure duplication at
best and a raw-JSON leak at worst.
Regression test proves no clarify progress content (raw JSON, verb
line, or question text) reaches the chat in verbose or all modes,
while unrelated tools still render progress normally.
Reported by @alexgrama-dev.
Fixes#52374
