Adds an ngspice-backed simulation testbench to a Zener `.zen` design. Use when the user asks to simulate a circuit, validate behavior in SPICE, or wire a `spice_model=SpiceModel(...)` into a leaf component. Covers `pcb sim`, `Simulation` property, and ngspice `.control` blocks with `tran`/`PULSE`/`PWL` sources and SVG `hardcopy` output.
This skill does not declare a tool allowlist. The agent host applies whatever default tools are available at runtime.
Registry
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