ngspice CI flow - #107
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The CI currently verifies cells structurally, i.e., DRC + LVS. This PR adds a functional layer: ngspice testbenches that simulate each block and check measured behaviour against expected values within a ±10% tolerance.
ngspice testbenches — Use the extracted netlist from DRC artifacts, apply stimulus and bias, and measure the figures of merit.
JSON test specs — one JSON per cell declaring the expected value and the pass band (default ±10%).
Results table — the runner parses ngspice output, compares measured vs expected, and renders a pass/fail row per metric
PDK compatibility is only verified for sky130