Synthesize onboarding feedback into themes (not anecdotes)

Synthesize onboarding feedback from the last {{N}} customers in {{segment}}.

Inputs:
- Survey responses: {{paste — open-ended and scored questions}}
- Drop-off / activation data per customer (if you have it): {{paste}}

Output:

## Top 3 themes
For each theme: the pattern in 1 sentence, the % of customers it appeared in, the segment(s) where it concentrated, 1–2 representative quotes (not the most extreme — the most representative).

## Wins
What worked. Same structure as themes — 2 bullets.

## Surprise findings
Things you weren't looking for. Often the highest-value section.

## What this changes
For each top theme, the specific change to onboarding flow / docs / CS hand-off this would imply. Be concrete: "rewrite step 3 of the in-product onboarding to surface X" — not "improve onboarding."

## What we don't know
Honest. Where the survey didn't ask the right question, or where N is too small to draw conclusions.

Hard rule: don't quote the most extreme respondent (positive or negative). They're the loudest, not the most representative.