v0.7.1

• The SCOPF Julia wire conversion is structural (#252): every struct reaching
  the wire classifies its fields (index, renamed, value) through an exhaustive
  destructure, so a new field fails to compile until classified and a value
  field reusing an index name is never renumbered. Wire output is unchanged.
• GOC3 parses once per read (#250): the reader hands its parsed document
  forward as Parsed::document, and the package boundary derives the
  operating point series from it instead of reparsing the retained text.
• DcOpfInstance carries the constant cost term c0 (generator and nodal
  data), and the DC OPF bundle writes c0.mtx/c0_gen.mtx (bundle schema
  0.3.0).
• Balanced formats harvest and emit coordinates (#183): PowerWorld aux
  Latitude:1/Longitude:1, pandapower bus geo Point strings, PyPSA
  buses.csv x/y, each in both directions. Writers with no geometry concept
  warn that locations were dropped.
• The standalone geographic document (#184): GeoLayer/ElementKey with
  tolerant reads (headerless buscoords CSV, aliased CSV/JSON records, GeoJSON)
  and canonical GeoJSON writes (.geo.json, the powerio_geo foreign
  member); DisplayFormat::GeoJson/DisplayData::Geo;
  Network::geo_layer()/apply_geo_layer() with multiconductor equivalents
  in powerio-pkg; Branch.route/DistLine.route polyline routing (payload
  schemas 1.2.0); .pwd promotion (geo_layer_from_pwd,
  apply_substation_points, pwd_mercator_to_lonlat); and
  powerio geo extract | apply | convert in the CLI.
• C ABI and Python bindings for the new surfaces (#249, #185), all additive
  (PIO_ABI_VERSION stays 4): pio_acopf_from_network / pio_acopf_to_json
  / pio_acopf_instance_free, pio_geo_parse / pio_geo_extract /
  pio_geo_apply, and pio_dist_geo_extract / pio_dist_geo_apply. Python
  gains parse_geo, Network.geo_layer()/apply_geo_layer()/acopf_instance(),
  and the distribution equivalents.
• DeepMind OPFData reader (#258): SourceFormat::DeepMindOpfDataJson reads
  one raw OPFData JSON document as a solved snapshot, echoes the same format
  byte for byte, and converts through the standard surface (CLI, C ABI,
  Python).

What's Changed

• Type the SCOPF wire renumbering and parse GOC3 once per read by @samtalki in #254
• Add the geographic document and balanced coordinate harvest by @samtalki in #255
• Bind the AC OPF instance and geographic layer over C and Python by @samtalki in #256
• Fix main CI: regenerate schemas, run PR workflows on stacked PRs by @samtalki in #259
• Add DeepMind OPFData JSON reader and conversion support by @cameronkhanpour in #258

Full Changelog: v0.7.0...v0.7.1