The 3-layer map config (base / overrides / rules). Asset placement & rules come next — for now this captures the terrain seed + params.
Pick an asset, then click the map to place. R rotates the ghost. Click a placed asset (no brush) to select; arrow keys nudge it, R rotates, Del removes. Right-click / Esc clears the brush (or close this panel on mobile).
Team tints are editor-only — players pick their colour in-game.