Add the D-240 hydrosphere modulator: water-rich worlds compress the equator->pole
temperature gradient toward the band midpoint (milder at both ends); dry worlds
swing the full class band.
- [hydrosphere_maritime] table in climate_constants.toml + ClimateConstants
field/method (maritime_factor). Keyed on the ACTUAL bodies.hydrosphere vocab
(liquid_water/ocean/extensive=0.6, rivers/moderate=0.8, ice=0.85, subsurface*
=0.9-0.95; minimal/trace/none/NULL -> 1.0).
- derive_temperature_c step 2 now lerps across a maritime-compressed sub-band
(mid +/- band_half*factor) instead of the full band. Clamp still guarantees the
class-band invariant.
- New maritime_hydrosphere_compresses_the_gradient test (ocean delta < dry delta).
Verified on real worlds: liquid_water/ocean temperate worlds now delta ~24 (milder)
vs dry ~40, all in-band. cargo test passes, clippy -D warnings clean, fmt clean.
Note: discovered derive_moisture_q has the SAME vocab mismatch (expects 'ocean',
DB uses 'liquid_water' for 175 bodies -> falls to default moisture). Pre-existing,
out of scope here — filing a follow-up.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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