/whattotest

Generate TestFlight WhatToTest document from changelog

# TestFlight WhatToTest Generator

Generate a WhatToTest document for TestFlight beta releases.

**Model**: Uses the model configured in `release-plugin.model` (see /release:changelog for model selection).

## Instructions

1. **Locate source content** (in priority order):
   - **If called from /release:changelog**: Use the `changelog-public.md` that was just generated in this session. Do not re-analyze - derive directly from that file.
   - **If called directly**: Look for source content in this order:
     1. `changelog-public.md` in the project
     2. Recent changelog files in the proje...