Search every Agentorist vertical at once — the answer to "what's on?".
Use this when the user's request spans verticals or doesn't clearly name
one ("what's on tonight", "anything to do in Boston?", "Friday night
plans"). For specific single-vertical queries ("movies tonight",
"Italian restaurants"), `search_all` auto-narrows to the hinted vertical
so you don't waste calls.
Returns `results_by_vertical` keyed by movies/events/local, plus
`total_count` and `bookable_total` for quick summaries.
Connector