Put your world map render here as:

    world_map.png

It ships inside the mod jar, so every player gets the map with no setup.

Sizing:
  - Keep the largest edge at or below 4096px. Bigger buys nothing: the mod caps
    textures there anyway, and some GPUs refuse larger ones.
  - Match the aspect ratio of the world region in factionmap.json
    (mapMinX/mapMaxX/mapMinZ/mapMaxZ). A mismatch stretches the map; the log
    prints both ratios if they disagree.
  - A 4096-wide PNG is normally 2-6 MB, which is fine to bundle.

A file at config/factionmap-data/map.png overrides this one at runtime, so a
server can ship a different or higher-resolution map without rebuilding.
