Series: The Learn Arc — 50 posts through the Active Inference workbench. Previous: Part 49 — Session §10.3: Where next Hero line. Fifty posts. Ten chapters. One framework. The Learn Arc closes here — with a reader's map, a short what-to-keep list, and a pointer to what is worth building next. What the Arc covered Posts 1–11 — The orientation arc. Why a BEAM-native workbench; the ten chapter