Terminal tool progress on markdown-capable gateways (Telegram, Slack,
Discord, WhatsApp, Matrix, Weixin, Feishu) renders the full command in a
fenced code block again, in all/new AND verbose modes — gated on the
adapter's supports_code_blocks capability. Plain-text platforms keep the
short truncated preview.
No language tag is emitted: Slack mrkdwn renders a '```bash' fence with
'bash' as a literal first code line, so a bare '```' fence is used, which
renders correctly on every platform that supports blocks.
This restores the #41215 feature (removed in #41950 due to the command
showing in group chats) as the default. For a personal assistant the
command display is desired; the group-chat concern is a preference, not a
vulnerability.
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