v0.20.1

Fixed

• Map data loader (src/map/load-data.ts) now imports Node builtins
  (fs/promises, url, path) lazily, inside the async load path,
  rather than at module top level. The static imports were hoisted into
  dist/index.js and broke browser bundlers (Obsidian's esbuild, the
  app's Vite/Rollup web build) that pull dgmo in. The loader is Node-only
  by contract — the web build injects MapData via DI and never calls
  it — so deferring the imports keeps the node code out of the eager
  browser chunk. Mirrors the existing await import('jsdom') seam.