feat(simulation): equilibrium hydrology solver prototype + bench (T-1177)

Priority-flood fill with basin grouping, topographic-saddle spill points,
moisture-governed endorheic classification (reuses the reserved
RIVER_DOWNSTREAM_TERMINAL sentinel), and Dijkstra overflow/carving. Pure
function of (elevation, sea_level, climate) — deterministic per D-010, no
stateful simulation. 15 unit tests incl. determinism proofs and direct
carving-mechanism verification; #[ignore]d release benches at 512x256 /
768x432 / 3840x2160 plus the 273-bodies-parallel production shape.

Workshop gate measurement (1) for body-map-viewer: settled hydrology is
VIABLE per body-open (~24 ms at 512x256; ~0.7-0.8 s all 273 bodies).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

This commit is contained in:

jpmschweitzer

2026-07-23 19:22:28 +02:00

co-authored by

Claude Fable 5

parent 77531a0eab

commit 05f9630cb4

3 changed files with 1283 additions and 0 deletions

server/src/atlas/hydrology_equilibrium.rs

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										server/src/atlas/mod.rs
									
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				@@ -23,6 +23,7 @@ pub mod drainage;

				pub mod features;

				pub mod gen_queue;

				pub mod heightmap;

				pub mod hydrology_equilibrium;

				pub mod layer1;

				pub mod layer_proxy;

				pub mod mosaic;