PC.8 Point clouds volumes: flight to flight, stockpile

Built in the lab: gaussian hill 0.02 % error, cone 0.12 % in engine tests. The browser stockpile on the 360 k scene is 6 % low and must be understood before it is called done.

civil-points-09 2026-11-05: Found why the browser stockpile read 6 % low: not the cell size, edges or resampling. The 8 m boundary crossed tree canopy; its samples raised the TIN base by 0.2 m on average. The base now leaves boundary samples above a robust fit out, and a smooth curved base is offered. The 6,000 m3 drone block now reads 1 % to 3 % off depending on the base (engine and browser cases added).