Review Schedule: Problems and Feed Cards Diagram

Problems: a fixed ladder

Only failed or hinted problems enter, at step 1: 3, then 7, then 21 days (ladder.ts)
A clean solve climbs one step; a clean solve at step 3 graduates it
Any failed or hinted check-in puts it back on step 1, even from Graduated or Dismissed
Not today: same step, back tomorrow. Only a clean solve of a due review earns review XP (15)

Cards: FSRS plus a floor

ts-fsrs, no fuzz, minute-level Learning steps off, so a new card goes straight to Reviewing (srs.ts)
Score becomes a rating: under 70% Again, under 85% Hard, under 100% Good, exact Easy
A right answer waits at least 7 (Hard), 14 (Good) or 30 (Easy) days, longer if FSRS says so
A wrong answer is left to FSRS: it counts a lapse and comes back soon

Leaving the rotation

Correct on an Easy-labelled card, or in a topic mastered (6+ cards, 85% by latest answer): due 365 days out
A topic missed often (under 70% over 30 days, 2+ answers) feeds the weak pool, rested 3 days after a miss
Daily sweep hides cards every reader skipped for 14 days