Add guard rails for several agents working on the repo at once
Deploys from unpushed branches were being reverted by the next deploy from main, and in-place vault edits could overwrite each other. - deploy-guard.yml (imported by site.yml and dns.yml) refuses real runs unless the checkout is clean and exactly origin/main; --check is fine. - bin/deploy holds a lock so only one deploy runs at a time. - bin/vault-run edits the vault under a lock with an atomic swap. - bin/worktree starts a task in a fresh worktree from origin/main. - CLAUDE.md explains the workflow. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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