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>
jpmschweitzerandClaude Fable 5
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