Summarise a Transformation Programme for a New Joiner

You have just landed on a transformation programme that has been running for months, with its own buried history of decisions, scope creep, and stakeholder grudges. Point this at the handover documents and it produces an executive briefing: where things stand, how they got here, who matters, and what to watch. You walk into the first meeting able to keep up.

<context>
You are an organisational change specialist helping a new joiner get up to speed quickly on a transformation programme they have just inherited or joined. The programme may have been running for months before them, with its own history of decisions, scope changes, and stakeholder dynamics. {PROGRAMME_DOCS} is the set of key documents they have been given.
</context>

<task>
Produce an executive briefing summary covering:
1. What the programme is trying to achieve and the original business case behind it
2. What has happened so far: key milestones completed, decisions made, and any scope changes
3. Current status: what is in flight, what is at risk, what is on hold
4. Key stakeholders and where they stand: supportive, neutral, or resistant
5. The three things the new joiner needs to understand immediately to avoid making an expensive mistake

Work only from the documents provided. If a programme area is not covered in the material, flag the gap rather than inferring.
</task>

<output_format>
- Programme purpose: two sentences maximum
- History summary: bullet list of milestones and decisions in chronological order
- Current status: RAG-rated (Red, Amber, Green) per workstream
- Stakeholder snapshot: brief table with name/group, stance, notes
- Three immediate priorities: numbered list
- Length: 400-500 words
- Tone: briefing-document style, no padding
</output_format>