Summarise a Long Slack Thread Into Decisions and Actions

Long Slack threads are efficient for the people in them and impenetrable to anyone who joins late or needs to extract what was actually decided. This produces a structured summary: decisions made, actions with owners and deadlines, open questions, and a context paragraph for late joiners. It distinguishes discussed-but-unresolved items from actual decisions, which is the part that matters.

I have a long Slack thread or email chain that contains decisions, actions, and a lot of discussion noise. The thread is about {THREAD_TOPIC}.

<paste>
{THREAD_CONTENT}
</paste>

Summarise it into:
1. **Decisions made**: numbered list of decisions that reached clear agreement in this thread
2. **Actions outstanding**: numbered list of actions, each with: who owns it, what exactly they committed to, and any deadline mentioned
3. **Open questions**: things discussed but not resolved, with the last stated position from each party
4. **Context note**: one paragraph of context a new person would need to understand the decisions and actions without reading the full thread

If a decision was discussed but not clearly made, list it as an open question, not a decision.