2.3.0

• Added a scientific validation campaign under validation/ for every method
  new in this release: per-index methodology READMEs, runnable validation
  scripts with pre-registered acceptance criteria, and versioned result tables
  and plots. Evidence includes the ISO 7730:2005 Annex D table and 58k ASHRAE
  Thermal Comfort Database II field records (PMV/PPD), NOAA SURFRAD ground
  observations and the live IFS open-data pipeline (fdir estimators), the NREL
  SPA ephemeris (Earth-Sun distance factor), and independent peer-reviewed
  implementations/transcriptions (pythermalcomfort, pvlib, BoM/Asghari forms)
  for the simple heat indices. Install pip install thermofeel[validation] to
  run; see validation/README.md for the verdict table (all PASS).
• Added calculate_discomfort_index: Thom's Discomfort Index (Temperature-
  Humidity Index) from 2 m temperature and relative humidity, returning Kelvin.
  Implements the Celsius/relative-humidity formulation of Thom's index given by
  Giles et al. (1990, https://doi.org/10.1007/BF01093455),
  DI = T - 0.55 (1 - 0.01 RH)(T - 14.5); the index originates with Thom (1959,
  https://doi.org/10.1080/00431672.1959.9926960). Validated against analytic
  reference values (including the RH=100% -> DI=Ta and T=14.5 °C -> DI=14.5 °C
  identities) and pinned by a regression CSV. Adds a guide page. See also the
  review Epstein & Moran (2006, https://doi.org/10.2486/indhealth.44.388), which
  uses a different wet-bulb formulation.
• Added a batch of new thermal indices (all vectorised, SI in/out, each cited
  and validated against published/independent references; see the per-index
  guide pages under docs/guide/):
  • calculate_apparent_temperature_radiation: the radiation-inclusive
    Steadman/BoM Apparent Temperature from 2 m temperature, 10 m wind, relative
    humidity and a caller-supplied body-absorbed net radiation q
    (Steadman 1994, https://doi.org/10.1071/es94001; Australian BoM).
  • calculate_relative_strain_index: the Relative Strain Index from 2 m
    temperature and relative humidity (Lee & Henschel 1966,
    https://doi.org/10.1111/j.1749-6632.1966.tb43059.x; hPa closed form and
    bands from Asghari et al. 2020, https://doi.org/10.2174/1874213002013010011).
  • calculate_summer_simmer_index: Pepi's Summer Simmer Index (common 1987
    closed form, an affine transform of Thom's THI) from 2 m temperature and
    relative humidity (Pepi 1987, https://doi.org/10.1080/00431672.1987.9933356;
    equation reproduced from secondary sources — see the guide).
  • calculate_pmv and calculate_ppd: Fanger's Predicted Mean Vote and
    Predicted Percentage of Dissatisfied (ISO 7730:2005; Fanger 1970), from air
    and mean-radiant temperature, body-level air velocity, humidity, metabolic
    rate and clothing insulation; validated against the ISO 7730 Annex D table.
• Modernised the examples/ scripts and notebook to the ECMWF earthkit 1.0
  stack (earthkit-data / earthkit-meteo / earthkit-plots): compute-thermal-indices.py
  now fetches gridded ECMWF forecasts online (open data, Polytope or MARS, or a
  local file) and writes GRIB/NetCDF; compute-obs.py computes indices from
  near-real-time station METARs; the notebook draws maps with earthkit-plots.
  Removed orphaned example data files. Install with pip install thermofeel[examples].
  (Examples are not part of the shipped library.)
• Added the thermofeel.approximations namespace (namespace-only, not
  re-exported at the top level) with estimators of the direct solar radiation
  fdir from global radiation ssrd + solar geometry, for datasets that lack
  it: approximate_fdir_erbs (Erbs et al. 1982, with an optional Earth-Sun
  distance correction) and approximate_fdir_disc (DISC; Maxwell 1987). Both
  reproduce pvlib to machine precision (validation oracle only). The
  compute-thermal-indices.py example exposes them via
  --approximate-fdir[=erbs|disc].