--skip-ones drops every fact involving 1 (trivial, not worth drilling),
121 cards instead of 144 for both multiplication and division.
SVG images never displayed on AnkiDroid (mobile) despite rendering fine
on desktop Anki — a long-documented, still-open AnkiDroid limitation
(multiple open ankidroid/Anki-Android GitHub issues), not a bug in the
generated markup. Rewrote shape/clock/coin image generation to render
PNG via Pillow instead, preserving the same geometry math (regular
polygons, clock-hand angles including the fractional hour-hand
movement, coin layouts) — card counts and content are unchanged, only
the image format.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014DyceEVVeQ33EeS6C1PDv5