test(02-07): rehearsal script; furigana at three layers, and a per-thread Sudachi tokenizer

fix(02-04): write the CT2 JSON files with LF so the README hashes match every checkout

feat(02-04): OPUS-MT ja-en converted to CTranslate2 int8 (LFS) with conversion script

feat(02-01): compact JMdict projection (LFS) with build script and asset guards

feat(02-01): pinned JLPT vocabulary and kanji-level data with build script

test(01-11): prove the tap unlocks audio under a strict autoplay policy at three layers

feat(01-10): vendor the 3D runtime and take the CDN out of the render path