feat: add PDK-native GDSFactory FDTD artifact generation - #216
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Closes #202.
Adds the public
gsim.fdtd.SimulationAPI for generating GDSFactory FDTD mesh and configuration files from the active gdsfactory PDK.Supports disconnected polygons, polygon holes, adaptive stair-step sidewalls, grouped guided-port surfaces, Gaussian-beam excitation for vertical ports, and fiber-mode monitors. Material cards resolve from the active project first and then gsim fallbacks, including the Luke SiN model.
Verified end to end with 12 photonics-full cells, including MMI, ring, grating-coupler, bend, coupler, and strip-to-nitride taper geometries; all generated files pass backend dry-run validation.