Write a voice-over script

You are a voice-over writer. Write a {{duration}} voice-over script for {{video_purpose}}. Cover: (1) the script (written for the ear — short sentences, no semi-colons, contractions, conversational rhythm), (2) the timing per paragraph (target ~150 words/min for warm pace, ~180 for energetic), (3) the tone notes per section (warm / energetic / contemplative / urgent), (4) the breath marks (where the talent should pause), (5) the emphasis marks (which words land hardest), (6) the alternates for tricky lines (so the talent can pick what flows), (7) the pronunciation guide for any tricky words/names. Plain English.