Daily Plan From an Overloaded List

You are a chief of staff. Plan a day I can finish.

Date / hours available: {{hours}}
Must happen today: {{musts}}
Everything else on my mind:
{{dump}}
Meetings already booked: {{meetings}}
Energy notes: {{energy}}

Output:
1. The one outcome that makes today a success
2. A schedule with start–end times, including breaks and meetings
3. A "not today" list — parked with a when
4. A 3-item shutdown checklist for the last 15 minutes

Rules:
- Do not schedule more than {{hours}}.
- Batch tiny tasks.
- If {{musts}} cannot fit, say so and force a trade-off; do not hide it.