standalone without our server: basemap and DEM load from the CORS-enabled upstreams, same-origin proxy only when a probe proves it exists; drop dead kumi.systems mirror

build.py

@@ -15,12 +15,11 @@ What gets inlined:
                                               (window.__inlineThemeCss, so
                                                theme switching works offline)
 
-The result needs no sibling files. Runtime DATA is still fetched on load:
-basemap and elevation tiles, Overpass road/settlement cells and the Open-Meteo
-weather API. Serve the file from the same nginx as the development site (its
-CORS proxies make the tiles reachable) or open it with a warm IndexedDB cache
-for fully offline rendering. Opened via file:// it still runs sky, clouds,
-terrain shading and the whole UI, just without the textured ground.
+The result needs no sibling files and no server of ours: basemap tiles, the
+elevation tiles and the Overpass mirrors are all CORS-enabled public sources,
+so the file runs from any static host or straight from disk (file://). The
+bundled nginx is optional - it adds the same-origin proxies and a 30-day
+Overpass cache, which is the gentlest way to hit those upstreams.
 
 The build fails loudly if any external script or stylesheet reference survives.
 """