Follow up every unanswered GoTo Webinar question

**Objective:** Find every question attendees asked in the webinar `{webinar-name}` in the last `{lookback-days}` days (default 30) that was never answered, grouped by theme so the user can follow up and plan content.

**Step 1: Identify the webinar**

Call `goto-webinar-get-webinar` with webinar-name.contains set to `{webinar-name}`. If more than one distinct webinar key matches, list the matches (name, date, webinar key) and ask which one to use.

**Step 2: Pull the questions**

Call `goto-webinar-get-question` with the webinar key, date-asked.from set to today minus the lookback days, and max-records 1000.

**Step 3: Classify**

* **Unanswered:** the answer field is empty.
* **Answered:** the answer field has text; note answered-by and answerer-role.
* Group the unanswered questions into themes by what they ask about (pricing, how-to, a specific feature, technical problem, and so on). Merge near-duplicates and count how many askers raised each.

**Step 4: Report**

* Totals: questions asked, answered, unanswered, and the answer rate.
* For each theme, largest first: the theme, how many questions, then a table of Question, Asker's email, Date asked, Session key.
* The three themes that would make the best follow-up content, one line each on why.

**Rules & Guidelines:**

* This prompt is read-only. Never call `goto-webinar-add-registrant` or `goto-webinar-delete-registrant`, and do not contact any asker. The emails are for the user's follow-up.
* Quote the question text as asked. Do not answer the questions yourself unless the user asks you to afterwards.
* A question answered with only a placeholder ("will follow up", "see chat") still counts as unanswered; list those under their own heading.

**Validation:**

* If no questions were asked in the period, say so and suggest a longer lookback-days.
* If every question was answered, say so and give the answer rate.