PC.14 Point clouds LAZ export

LAZ export of the cleaned cloud, next to LAS 1.4.

laz-09 2026-11-06: Built: our own LAZ compressor (lib/pointcloud/laz.js, Apache-2.0, written from the public LAZ specification 1.4 R1 of rapidlasso GmbH; no third-party code: laz-perf ships a decoder only, laz-rs and LASzip would need a WebAssembly build we cannot run here). Point formats 0 to 3 with extra bytes, chunked (compressor 2), in a LAS 1.4 header. CivilCraft Point clouds add-on: Export, File type LAZ (format 0, or 2 with colour; classes above 31 refused). Tested: our reader, laz-perf 0.0.7 and laspy 2.7.0 + lazrs 0.8.2 read every field bit for bit (formats 0-3, several chunks, GPS jumps, grey and coloured RGB); three LAZ files made by laspy re-encode to the same bytes and chunk table; the 300 m made-up site (353,766 points) is 2.17 MB LAZ against 10.61 MB LAS 1.4 (20.4 %); in the real page (/lab) download and streamed save byte-identical (bin/test-pointcloud-laz.mjs 65/0, tools/pointcloud-engine/browser-laz.mjs 10/0). Not built: LAZ formats 6 to 10 (layered). Not tried: other LiDAR programs (community test PC.14-HAND).