A status headline replaced the rolling tool lines instead of sitting above
them, so a default Discord draft showed one preamble sentence for an entire
tool-heavy turn. Operators reached for `/verbose` to see any activity, which
delivers durable per-tool-call messages and floods the channel.
- Render the headline above the lines; both stay visible in one message.
- Shorten the start gate from 5s to 1.5s. The gate only creates the draft
when the timer fires and finalize cancels it, so quick answers still post
no draft while a 3s tool turn stops being silent.
- Drop Discord's label-gated tool-progress default so
resolveChannelStreamingPreviewToolProgress is the single owner. An explicit
`toolProgress: false` still silences the lines.
- Resolve that toggle against a "progress" mode guess when `streaming.mode`
is unset, so the progress-draft channels stop ignoring an explicit
`progress.toolProgress` opt-out.
Telegram now defaults to `streaming.mode: "progress"` like Discord; set
`"partial"` to keep streamed answer text. Its renderer draws work lines from
the compositor's structured lines, so `rendersRollingLinesNatively` keeps
them out of the composed text rather than printing every line twice.
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