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Say DC or AC resistance in README intro and package description

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The intro predated the skin-effect feature; the AC capability was only
mentioned under Model & limits.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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# Fill Resistance — KiCad 10 plugin
Computes the **DC resistance of copper zone fills** between two contacts,
**single- or multi-layer**: the chosen net's fills on the selected copper
layers are solved as coupled finite-difference sheets linked by the net's
**via and through-hole-pad barrels** (18 µm plating, configurable). Shows
per-layer rasterized maps, potential, current density, and **power
density**, reports **per-via currents** (via ampacity!) and total
dissipation at a **selectable test current**. PNGs + a text summary are
saved per run.
Computes the **DC or AC resistance of copper zone fills** between two
contacts, **single- or multi-layer**: the chosen net's fills on the
selected copper layers are solved as coupled finite-difference sheets
linked by the net's **via and through-hole-pad barrels** (18 µm plating,
configurable). At a user-set **frequency** the exact 1D foil/barrel
skin-effect correction is applied (AC results are a rigorous lower
bound — see *Model & limits*). Shows per-layer rasterized maps,
potential, current density, and **power density**, reports **per-via
currents** (via ampacity!) and total dissipation at a **selectable test
current**. PNGs + a text summary are saved per run.
Uses the KiCad **IPC API** (`kicad-python` / `kipy`), not the deprecated
SWIG API. Requires KiCad **10.0.1+**.