Public Speaking & Presentation System.

### Input
Topic, audience, duration, goal

### Task
Design the presentation strategy. Define: the core message (the single most important thing the audience must remember — 1 sentence), the audience's starting belief vs. desired ending belief (what shift in thinking must occur?), the narrative arc (problem → insight → solution → call to action), the emotional journey (what emotion should the audience feel at the start, the middle, the end?), and the success metric (how will you know this presentation worked?).

### Output
Core message + belief shift + narrative arc + emotional journey + success metric