forked from 1b-agent/fieldcraft-upstream
Capturer::rgba becomes offscreen() (sizes, error scopes, MSAA, depth, read-back) plus finish() (background and labels), so another painter, such as the window's paint callback, can draw into the same pass. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo