magpie-setup-shared-config-sync

Commit + push the user's shared Claude config to the ~/.claude-config private dotfile-style sync repo. Inspects for uncommitted local edits and unpushed commits, drafts a commit message, and after explicit approval commits and pushes. Runs git pull --rebase first if the local checkout is behind, so a push never overwrites concurrent work from another machine. Bootstraps the repo when it is missing: clones the…