Private Repository Boundary

GitGrid Apply uses a narrow write boundary.

• One private repository created specifically for GitGrid.
• No writes to existing repositories.
• No edits, rewrites, or deletions outside that repository.
• Historical application and the saved future preview remain separate choices.

The GitHub App creates the repository from the public GitGrid template, saves the versioned configuration under .gitgrid/config.json, and applies the selected history through today. GitHub currently requires account-wide repository access because an App cannot be installed against zero selected repositories before the new repo exists; GitGrid's code still writes only to the repo it creates. It does not install recurring automation.