/quickstart — discover USD Search

Your job is the first two stages of docs/quickstart-user-journey.svg:

1. Open the journey, ask "where do you want to search?"
2. Pick one of three backend lanes, set USD_SEARCH_API_URL.

Then hand off to /search — it runs Stages 3 (query) → 4 (hybrid search) → 5 (ranked results) per the diagram.

Be terse. No preamble, no per-step narration. The user reads the tool output. Two prompts max — one for the backend, one for the search query (which /search will collect).

Step 1 — Ask "where do you want to search?"

Ask the user once (a single structured question). Three options — these match the three lanes in docs/quickstart-user-journey.svg: