When the unknown-channel approval flow completes, seed a /welcome task
into the newly-wired session so the agent greets the new user on first
contact. The replayed /start (Telegram's default first-message) is filtered
by the agent-runner's command-command filter, so without an explicit
onboarding trigger the first interaction produced nothing.
Pin the destination by its local_name from agent_destinations to avoid the
agent picking the wrong named destination (previously it greeted the owner,
whose DM is in CLAUDE.md).
Also guard dispatchResultText against echoing trailing status lines when
the agent has already sent messages explicitly via send_message. Otherwise
a task-triggered flow that calls send_message then emits "welcome message
sent" produces a duplicate chat to the recipient.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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