Still PURE ANALYSIS — zero terrain change, zero water; the source blueprint is
never written (md5-verified). Extends task 21 per the developer's b+c decision:
promote ~5-6 rivers, the natural ocean trunks PLUS the top endorheic giants.
Giants (top GiantCount terminal basins by per-basin total inflow) get their main
stem anchored on the STRONGEST FEEDER into the basin, not the basin's deepest
cell — on a flat basin floor the deepest cell sees only local trickles (the
task-21 lesson applied to stems). Classification is by what the terminal BASIN
holds, not the stem's single pooling cell (a stem can pool on dry ground a few
hundred px short of its lagoon and still be a lagoon river): basin holds a
classify lake -> LAKE-ENDER; dry pan -> ROUTED; the giant pooling nearest the
southernmost town is the SOUTHERN CANDIDATE and always ROUTED (shown, not
forced). Routed giants carry a PROVISIONAL route: steepest descent on the FULL
(no-terminal) epsilon fill, so the basin overtops at its spill and the walk
follows the terrain's own drainage to the ocean — the technique part 2 carves
with, here only drawn and flagged provisionalRoute_NOT_WATER in the JSON.
Seed 1280587109 result (defaults, 6 rivers): 3 ocean trunks (unchanged from
task 21) + GIANT 1 [ROUTED - SOUTHERN CANDIDATE] 2.27M px pooling in the SE
lagoon, 932-px route via spill (6598,5866) to the ocean — the island's biggest
river serving the south; GIANT 2 [LAKE-ENDER] 1.82M px ending at the E lagoon;
GIANT 3 [ROUTED] 1.76M px SW dry-pan system, 1716-px route to the SW coast.
All provisional routes reach the ocean. Analysis 22 s.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Pure analysis over the ERODED render map: changes zero terrain, adds zero water.
Priority-flood (task-03 family, Barnes heap+pit, 8-connected) with a one-ulp
epsilon so every filled pit keeps a strictly descending routing path — the ~16.5k
erosion pits route through; depressions >= 2 m deep and >= 10k px survive as
terminal basins (70 on the working seed). D8 flow directions on that routing
surface (D8 as a COMPUTATION, not the reverted carving use), Kahn-propagated flow
accumulation, then promotion: TRUE-ocean outlets (WBID 1 only — two of the first
draft's three 'sea-reaching' trunks actually ended in enclosed lagoons, which is
exactly the overclaim the gate must not inherit) ranked by drainage area, top ~3
with outlet separation become trunks; max-accumulation stems; mountain-exit from
sustained along-stem grade; lean deduped tributaries; lean endorheic terminals
credited with per-basin TOTAL inflow (acc at the deepest cell undercounts flat
lagoon beds 10x — measured).
Output: console report + a JSON plan sidecar next to the source blueprint —
deliberately NOT a blueprint section, so the plan cannot masquerade as realized
water. The source .dat is never written (md5-verified). Headless tool, ~21 s
analysis on 8K; RIVERPLAN_* env dials.
Seed 1280587109 findings for the gate: 3 ocean trunks spread west/north/east
(436k/409k/325k px); the island's five LARGEST systems (1.1M-2.3M px) are all
endorheic — three end in big enclosed lagoons (classify lakes, 19-20 m basins),
two in dry pans; 62.9% of land does not drain to the open ocean, the drainage
restatement of task 18's 'erosion cannot cut the lowlands'. The 2.27M-px giant
terminates in the SE lagoon ~1.1k px from the southernmost town (filed south
report, not enforced).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
