Floorplan 0.4.0

• Export a copy to share: the map's new Export button saves one HTML file anyone can open in a browser, with nothing to install. It has the whole map without the Ask bar, your folder path or git remotes. Flows and notes go in by default; recent work and the health check (or a blueprint's design review) only if you tick them. Ask Claude or Codex to "export the floorplan", or run node floorplan/serve.mjs --export.