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Thematic development (乐思发展层) - what the theme is and what each section does with it. Owns `material` (motif, character, stated_in) and `form[].development`, a closed set of ten operations (repeat/sequence/extend/contract/fragment/vary/augment/counterpoint/new/recap). Covers the line between developing and piling up, each operation with its criterion and cost, motive-to-phrase construction, phrase-to-section-to-whole (overlap, supplement, recapitulation), the variation branch, and where it all lands in a pop song. Use when every section sounds like new material, when a song feels loose, when deciding what the second verse or the last chorus should do, or when filling `material` and `form[].development` in an ARR-SPEC. 乐思发展、动机、主题材料、每段都在写新东西、扩充、减缩、裁截、模进、变奏、再现。

Generate original one-ink or controlled two-ink editorial images from any theme, sentence, article idea, object, or reference photo. Always use this skill when the user asks for 单色海报、双色印刷、单色调视觉、蓝色/绿色孔版印刷、risograph、网点照片、复古或当代编辑排版、zine poster, monochrome editorial poster, duotone print, or asks to use the mono-color style. It uses an adaptive white, gray, or pale-beige substrate, no more than two printing inks, active negative space, terse human language, and strong serif/grotesk/mono typography without making retro styling the default or copying a source composition, wording, logo, or artwork. Produce both the final generation prompt and the generated raster image unless the user explicitly asks for prompt only.