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feat(simulation): T-1156 — quantized river_class on RiverNetwork (trunk/tributary/stream)

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The one additive server change of wave 1 per Tyre's carrier ruling:
river_class: Vec<u8> parallel to river_cells, serde-default-safe, no
new wire field. Log-scaled binning between RIVER_THRESHOLD and the
RIVER-RESTRICTED max accumulation (max over cells passing the is_river
elevation filter — NOT the grid-wide max, which peaks past the
coastline on wet large-ocean bodies and would starve the trunk class
exactly where Araminta's District-shows-trunk-only table needs it;
caught in lead review of round 1, fixed round 2). Log not linear
because accumulation grows combinatorially downstream. By construction
every body with rivers has trunk cells — pinned by a non-synthetic
regression on the committed GJ1c heightmap at the golden's exact
downsample. cascade_layer1.json regenerated: every pre-existing field
byte-identical (python-verified), only the new river_class arrays
added — GJ1c distribution stream 72 / tributary 18 / trunk 3.
drainage 16/16 (+10), layer1 3/3, layer_proxy 50/50, build --tests
clean; revert-verified (non-monotonic binning fails the monotonicity
test by name).

Tickets: T-1156

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
jpmschweitzer
2026-07-23 08:10:00 +02:00
co-authored by Claude Fable 5
parent 365b044e79
commit ff98a10d42
4 changed files with 341 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
server/tests/gen_fixtures.rs
+1
View File
@@ -557,6 +557,7 @@ fn generate_atlas_layer_response_fixtures() {
river_cells: vec![(12, 58), (12, 59)],
confluences: vec![],
mouths: vec![(12, 58)],
river_class: vec![1, 2],
},
drainage_basins: vec![DrainageBasin {
basin_id: 1,
server/tests/golden/cascade_layer1.json
+95
View File
@@ -8216,6 +8216,101 @@
124,
239
]
],
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