[N7z]

The first number moves because the saved map format changed in a way an older build cannot read: a
map now carries one lighting rig instead of a lights list, a part can carry a name and a light,
and a folder can name a parent. Maps saved by 1.2 open here untouched; maps saved here are refused
by 1.2.

In this release

• Lighting. One sun and an ambient fill, edited from the Explorer, in place of the old list of
  suns. A part can carry a point light or a spot light, which travels with the part and aims out of
  one of its faces.
• Tone mapping. The viewport maps light onto the screen with a filmic curve and an exposure
  control, so bright surfaces roll off instead of clipping to white.
• Folders inside folders, as deep as you like, with drag and drop in the Explorer to nest them.
• Explorer. Right click for what a row can do, F2 to rename, Workspace and Lighting collapse,
  parts can be given a name of their own.
• Sliders on the properties that have a floor and a ceiling, on a track you can aim with.
• Undo covers folder changes, reaches the panels, and treats one drag as one step.
• MCP server (mcp-server/), so Claude Code can build and refine maps live in a session.
• The Arrange panel is gone.

Checklist

• npm test — 47 passing
• ./vendor/bin/pest — 145 passing
• live-editing-server — 115 passing
• mcp-server — 77 passing
• version bumped to 2.0.0
• merged with a merge commit
• tagged v2.0.0 on the merge commit
• release published
• master merged back into develop