Rivers now appear on the whole-body map for the first time. Five on Ferrath's
Global canvas, drawn as 5 px strokes that stop at the coastline.
Four rules, all client-side over existing server data, computed once on canvas
adoption rather than per draw:
- fixed 5 px screen-space stroke at every rung
- contiguous geometry through the river's own cells
- never drawn over water — ocean and lake end a run
- culled below 15 px of on-screen length (3x the stroke: below that a line
is a square, not a river)
TWO THINGS THE MEASUREMENT FOUND THAT THE RECORD DID NOT ANTICIPATE.
First, the cull unit was wrong. A server "course" is an EDGE of the river
network — the stretch between two confluences — not a river. Culling per
course culls per segment, so a long river assembled from many short edges
vanishes entirely. Measured on Ferrath Global: 375 courses, 180 surviving the
water clip, and ZERO surviving a per-course cull. Edges are now chained
end-to-end into rivers before the cull is applied, which also delivers the
other half of D-261's "contiguous": per-course contiguity only makes each edge
unbroken; joining is what makes a river read as one line rather than dashes.
After chaining, 5 rivers survive at Global — the "major systems only from
orbit" behaviour the record predicted, arrived at by a different route.
Second, and worse: uses_orbital_derive() still read `Global | Region` while
the client's mirror had said Global-only since 2026-07-26. The D-255 amendment
claims "Region left the orbital derive set... it now takes the full
courses-aware derive". That was implemented against the MIRROR and never
against the authority, so Region kept running envelope-only and carrying no
courses — the exact thing the amendment said it had stopped doing. Both test
suites stayed green for two days because neither compares itself to the other.
Fixed here, with a note on each side pointing at the other, since the two
cannot be cross-checked automatically.
Also removes the two gates that withheld courses from the orbital rung — the
reason the whole-body map had no rivers at all. Whether a course is worth
drawing is measured in screen pixels, which only the client knows, so the
server now supplies geometry at every rung and the client decides.
The capture harness reports "drawn" alongside "courses", because "375 courses
arrived" and "375 rivers are drawn" are different claims and conflating them
is what made an empty map look like a data problem.
Client suite 1836 / 1810 passed / 26 skipped. Server suite green.
Co-Authored-By: Claude <noreply@anthropic.com>
jpmschweitzerandClaude
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