writing-fragments

基于素材碎片进行探索性挖掘，生成可用写作片段。

用闲聊式的提问把零散素材挖成可用的写作片段，不急着搭结构，只求把想法、句子、例子扩展出来。适合写作初期做探索和发散，不要马上要求大纲或成文稿。特点是通过不断追问把模糊想法变成具体的 fragments，供后续写作或结构化技能使用。

<what-to-do>

This is pure **explore**: widen the space of what could be written without committing to structure — committing is _exploit_, a separate skill's job. Run a grilling session that produces fragments, interviewing the user relentlessly about whatever they want to write about. Imposing phases, outlines, or article structure is out of scope here.

As fragments emerge from either side of the conversation, append them to a single markdown file.

If the user did not pass a path, ask once where to save the document, then remember it for the rest of the session.

Capture fragments from the very first thing the user says, including the initial prompt.

On first write, put a single H1 at t