Tool-progress now shows a terminal command in a ```bash fenced block —
full command, no surrounding quotes, no label, no 40-char truncation —
instead of the noisy `terminal: "cmd…"` line, on every platform that
renders markdown code blocks (Telegram, Slack, Matrix, WhatsApp, Feishu,
Weixin, Discord). Plain-text platforms keep the compact preview line.
Gated on a new `BasePlatformAdapter.supports_code_blocks` capability
(default False) rather than a hardcoded platform list, so plugin adapters
(Discord lives in plugins/platforms/) opt in by setting the flag. Applies
to both all/new and verbose progress modes, with a safe fallback when the
command arg is missing or blank.
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