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docs: document the Sommerfeld near-ground limitation deck (PR #137) - #141
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Add a Tests entry to the CHANGELOG and a Known-limitation decks section to the testharness README for sommerfeld_near_ground.nec: a horizontal half-wave dipole 0.02 wavelengths above a GN 2 ground with sigma 1e10 (effectively a perfect conductor). Verified on master: every engine descends from SOMNEC and returns R ~ 1.759 ohms / gain ~ 1.043 where the perfect-conductor limit (GN 1) is R = 0.9168 ohms / gain 1.9953; the pre-e3f81e6 interpolation bug accidentally landed near the exact limit (R = 0.924, gain 1.980, reproduced on a8e829e). The deck joins SOM_TESTS and documents current behavior on all engines rather than gating pass/fail.
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Follow-up to the just-merged #137: adds a Tests entry to the CHANGELOG (Unreleased) and a Known-limitation decks section to
testharness/README.mddocumenting whatsommerfeld_near_ground.necdemonstrates.All figures verified against current master before merging #137 (see PR #137 discussion verification):
GN 2σ=1e10 gives R ≈ 1.759 Ω / gain 1.043 in nec2++ and nec2c where theGN 1perfect-conductor reference is R = 0.9168 Ω / gain 1.9953, and the pre-e3f81e6code accidentally landed near the exact limit (reproduced ona8e829e: R = 0.9239, gain 1.9802).Docs only — no code changes, no release.