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Interactive physics lab in the DSH sidebar — 24 parameter-driven animations (mechanics, electromagnetism, optics, thermodynamics) grouped by grade, each with a knowledge-point lesson whose steps follow the animation, a quiz with answer checking, and a draggable 3D view for four field models. Pure client side: analytic solutions computed locally, no LLM calls, no network, no telemetry.

Visualizes Finesse 3 KatScript in the conversation and adds a drag-and-drop optical bench designer that generates the Finesse model. It scans every user and assistant message for KatScript or a Finesse Python cell and renders them in the background with the first Python interpreter that can import finesse (Finesse 3, NumPy and Matplotlib required; interpreter overridable with FINESSE_VIZ_PYTHON), keeping the code and figures under ~/.dsh/finesse-vis.