`/handoff slack` bound the CLI session under `slack🧵<channel>:<ts>` while every inbound
reply in that thread resolves (via the Slack adapter's source shape) to
`slack:dm|group:<team>:<channel>:<ts>`. After a gateway restart the reply key found no
binding and the gateway opened a fresh empty session, orphaning the handed-off one (#111896).
The handoff destination now mirrors the adapter: chat_type `dm` for a D… home channel, else
`group`, plus the workspace scope_id (home channel provenance, falling back to the adapter's
channel→team map). Channel handoffs were equally affected (`thread` vs `group`), so the fix
covers both, not only DMs. Discord and Telegram destinations are unchanged.
Co-authored-by: KoNit-K <124019182+KoNit-K@users.noreply.github.com>
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