`seed.py` matches a seed file to its scenario by title, so renaming one
inserted a second public scenario and stranded the first. The stranded row
stays public forever and has to be deleted by hand on every deployment, which
is what happened to "Road to the Champion". A seed file now lists its old
titles under `previous_titles`, and the rename updates the existing row.
The cover art is a PNG data URI. `app/images.py` accepts raster formats only,
because SVG can carry script and the bytes are served from the app's own
origin, so an SVG stores but yields an empty `image_url`.
`tools/make_pokeball.py` draws the ball with `zlib` alone.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PacdRuPXSkQQy4ZYdH32hF
