- internal/sampling: ComputeWeight (Laplace-smoothed error rate + recency
multiplier, floor 0.15) and SelectWeighted (A-Res reservoir algorithm).
10k-run statistical test verifies weak questions appear >3x more often
than mastered, and mastered questions still appear (floor exercised).
- GET/POST /test/new: source filter with live available-count JS update,
n-questions input, weighted vs uniform mode radio.
- GET /test/{id}/q/{n}: deterministic answer shuffle per (test_id,
question_id), progress bar, mobile-friendly large tap targets.
- POST /test/{id}/q/{n}: records answer + upserts stat; advances to next
question or finishes test and redirects to results stub.
- GET /test/{id}/results: stub (Phase 7 will add full review).
- Ownership enforced: all test routes 404 for wrong user.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Jānis Kacēns
968479ff51