Documents the install-time handoff contract that previously lived only in Program.cs comments: single-profile document + --import-profile, exit codes (0/1/2/3), the tray-must-not-be-running rule and installer sequencing, per-user/per-session scope, idempotent replace-by-name, and the game-repo reference-copy convention (dxx-rebirth pattern). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>