delegate-backlog

Delegate an approved backlog to a real async coding agent (GitHub Copilot coding agent) so several stories are worked in parallel — one branch and PR per issue — then re-apply the kit's quality via pr-review/fix-pr on the resulting PRs. The async, throughput-first alternative to running work-story interactively per story. Verifies the async target exists (never fabricates a trigger) and never auto-merges. Use when a PO/dev wants to fan a backlog out to an async agent.