sikit: FDTD validation doc#57
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What each of the 5 validation checks pins down, in the same style as emikit/VALIDATION.md. Plus the three known v1 limitations (CPML, TF/SF source, microstrip S21) so they don't get rediscovered later.
Same 50 x 30 x 20 mm PEC cavity in both tools, finds the TE_101 peak via FFT, compares against each other + the analytic Pozar formula. analytic : 8.0722 GHz sikit : 7.7952 GHz (-3.43% vs analytic) openEMS : 7.7964 GHz (-3.42% vs analytic) |sikit-EMS| : 0.02% The 3.4% offset from analytic is Yee mesh dispersion (expected). The 0.02% agreement between the two codes is the headline -- two independent FDTD implementations land on the same number for the same mesh. tools/cavity_openems.py builds the openEMS run; the resulting peak is committed as tools/openems_te101_peak.txt so re-comparison doesn't need openEMS installed. tools/validate_fdtd_vs_openems.cpp runs the sikit side + does the comparison.
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Adds sikit/FDTD_VALIDATION.md documenting the 27 validation tests across [fdtd3d], [fdtd-raster], [fdtd-port]. Same format as emikit/VALIDATION.md.