New prompt method generates spoken talk tracks before presentation slides

1. Instruct the AI model to write a spoken talk track first as plain-spoken paragraphs, focusing on a clear narrative arc of the problem, turn, and payoff.
2. Review and approve the written talk track before moving on to slide creation.
3. Prompt the AI to generate one slide per beat of the approved track, limiting each slide to a six-word headline and a maximum of three supporting points.