Polaris-Aeterna

Turn a textbook chapter, lecture, or paper into beautiful "fill-in" study notes — written to be READ (clean statements, intuition) yet engineered to be FILLED (blanks, proof skeletons, "your turn" computations) so the reader learns by active recall. Notes are typeset with the Loom XeLaTeX class in this repo. Use when the user wants study notes from a source with gaps to fill in, worked examples restaged as exercises, or theorems stated but proofs left open. Triggers: "make fill-in notes", "turn this chapter into notes I can fill in", "guided / skeleton study notes", "study notes from this book/PDF", "读+填 笔记", "被动+主动 learning notes". NOT for a plain summary, a polished paper, or notes with every detail spelled out (that kills the active layer).