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feat(simulation): district moisture spatial gradient (T-1080)

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moisture_q was a single body constant (derive_moisture_q took only &BodyParams →
80 for every one of 2048 ocean-world districts), so vegetation/terrain/ecotones
were uniform — "nothing to fuzz" (the T-1080 believability bug).

- district_profile.rs: derive_moisture_q is now a body ceiling (hydrosphere+atmosphere)
  × per-district gradient — latitude (equator wet → pole dry), elevation (orographic/
  rain-shadow), continentality (100 − ocean_fraction_q). Integer/D-010, no new plumbing
  (elev_q/ocean_fraction_q/latitude_deg already reach build_district_profile). Mirrors
  D-240's temperature model. Coefficients in ClimateConstants + climate_constants.toml
  [moisture_gradient] (provisional; Q-123 calibrates). Tuned so a wet body stays mostly
  green with drier patches and a frozen body clamps mostly barren. + gradient unit test.
- region_profile.rs: region-tier moisture gets the region-latitude gradient (elevation/
  continentality are district-scale).
- Propagates to precipitation_class / vegetation_class / morphology_zone (all read
  moisture_q). D-239 §2 amended. Believability golden regenerated.

Probe (Arbour @ yolo): moisture_q distinct 1 → 49 (spread 0 → 48); 5/7 → 6/7 criteria.
Edict (frozen): moisture 0..20 ×21 — gradient within its low ceiling. Remaining fail
(vegetation-present) is the metric dividing by all-sampled incl. water on a 2/3-ocean
world — a Q-123 calibration concern, not a climate defect.

clippy --all-targets -D warnings clean; 1580 lib tests + harnesses pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
jpmschweitzer
2026-06-28 17:25:18 +02:00
co-authored by Claude Opus 4.8
parent cdc55032df
commit bb5069aa13
7 changed files with 171 additions and 23 deletions
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server/src/atlas/region_profile.rs
+6 -2
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@@ -304,8 +304,12 @@ pub fn build_region_profile(
let body_seed = seed.seed();
let baseline_temp_c = derive_region_baseline_c(&region_params, constants, body_seed);
// Moisture at the region tier is body-scale (same as body_params).
let moisture_q = crate::atlas::district_profile::derive_moisture_q(body_params);
// Region-tier moisture = body ceiling × region-latitude gradient (T-1080). The
// elevation + continentality components are district-scale, so at the region tier
// elevation is sea level (0) and continentality is neutral (ocean_fraction 100);
// the district derivation adds those on top.
let moisture_q =
crate::atlas::district_profile::derive_moisture_q(&region_params, 0, 100, constants);
RegionProfile {
pos: region_pos,