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Vite + React + TypeScript + Vitest. No router, state library or UI kit. The 159-row combo table is extracted from reference/index.html by scripts/extract-reference-data.mjs rather than retyped: it balances brackets past string literals to slice out the pure-data declarations and evaluates them in a vm with no DOM. raw.ts and labels.ts are generated. The extracted count matches the 159 the Phase 1 app reported on device. Entry.id keeps the reference's format verbatim (shift>p1@S#FIX VEL), built from the unsplit context string, so drill progress already on the phone migrates instead of being orphaned. The domain is pure where the reference was not: boxes go in and new boxes come out, and the random source is injected. That is what made card selection testable. Two bugs found by doing so: - pickCard returned the card just answered when random() gave exactly 0. A zero-weight card does not move the accumulator, so "r <= 0" matched it. The reference has this; at one draw in 2^53 it is invisible in use, but a pinned random source hits it every time. Fixed to "r < 0". - boxDistribution incremented through an index that noUncheckedIndexedAccess types as possibly undefined. 65 tests. Several assert numbers observed on the device: 159 entries, sample-mode layers of 3 / 35 / 2, a 16-card SHIFT+pads deck. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>