teachback — teach the material back as a self-contained interactive page

Self-Evolving Skill: this file improves through use. If an instruction here is wrong, a gate rejected a page it should have accepted, or you needed a workaround — fix this file immediately, don't defer. Only for real, reproducible issues. And when you add a check to a gate, add the mutation that proves it can fail: an unexercised check is not yet a check.

Produces one HTML file that explains hard material to an intelligent reader with no assumed specialist background. The page runs from file:// with no server, no tracking and no framework.

The defining behaviour: teachback reads what is already in the working context. Do not ask the reader to restate material the conversation already contains. Infer the subject, scope, prerequisites, title, filename and technical depth.