Slack: restart a conversation with "new" and replay its messages

[nocell]

Summary

In Slack, @Wirebot new inside a thread and plain new in the bot DM now restart that conversation's Codex task, and the fresh task gets the conversation so far as context.

Mentioning the bot with /new already worked, but Slack's composer swallows a leading slash in DMs, and people naturally write @Wirebot new. More importantly, a restart used to throw away everything the thread had discussed: the new task started blind. Now the connector remembers the restart and, on the next ordinary message in that conversation, replays the messages posted before it — the thread's replies via conversations.replies, or in a DM the recent history via conversations.history — as the same plain-text Name: text prefix a first mention in an existing thread already uses (8,000-character budget, oldest dropped). The prefix says explicitly that the previous task's memory is gone and this is reference material. /wirebot new and @Wirebot /new gained the same carry-over.

Implementation

• parseSlackCommand (moved to slack/message.ts) accepts /name args as before plus a small set of bare command words, currently just new; used both for dispatch and for keeping commands free of context prefixes.
• SlackChannel keeps a bounded in-process map of restarted conversation keys → the new message ts; withRestartContext consumes it on the next message. formatThreadContext takes an optional beforeTs cut-off.
• SlackMessagingApi gains fetchHistory(channel, latestTs, limit).
• ChannelTraits.restartCarriesHistory lets the bridge's new confirmation mention the carry-over on connectors that do it (Slack only for now); Telegram and Discord behave exactly as before.
• docs/slack.md documents the command and the in-process nature of the pending carry-over.

Testing

• bun run check and bun test pass. Manually exercised the parser on the slash form, bare new with case/punctuation, and non-matches such as renew or what's new?, and the restart cut-off in formatThreadContext.

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