Skill audit report

lw-cantonese Audit report.

The Cantonese layer for lyric writing (粤语填词的协音层). Cantonese has nine tones plus a tenth, and a syllable sung against its own tone is heard as a different word, so tone-melody agreement is a hard constraint, not a risk score. Gives the worked system: the nine tone values and their singing names 「三九四〇五二一八六」, the four class-scales 「〇二四三」 grouping the tones by tone-tail, the truth table of natural intervals between adjacent characters, true values versus approximations and best approximation, the three-eighths and three-sixteenths laws, the elasticity of natural intervals (outward-stretching versus inward-drawn classes, the ring diagram, crossing the boundary means a wrong tone), the six-tone same-rhyme test, and when a title line may deliberately be sung off. Also covers melody-first order, rhyme, the entering tone, register, and style periods. Use when writing or checking Cantonese lyrics, or when a sung line comes out as the wrong word. 粤语、协音、九声、类音阶、声调唱名、真值表、自然音距、最佳逼近、八分三定律、六调试音法、粤语歌填词、