v2.3.4

What's Changed

• Update necpp_src to v2.3.4 — see upstream changelog
  • Breaking: get_impedance_real/imag now accept feed_index parameter (imp.back() → imp[0])
  • New: nec_impedance_real_indexed/imag_indexed C API for specific feeds
  • Doxygen documentation for multi-feed access patterns
  • v2.3.3: Fix GX solve and three-plane symmetry reflection
• Update PyNEC SWIG interface to match new impedance API

Full Changelog: v2.3.2...v2.3.4