herdr-orchestrate

Use when an agent orchestrates worker agents through Herdr — spawn an isolated worktree workspace per task, start any supported agent kind in it, brief it, wait on semantic state, verify the gate, tear down. Provider-agnostic: the mechanics are herdr CLI + git worktrees; any supported agent kind is an interchangeable worker. Covers the spawn sequence, blocking waits, label-vs-state semantics, sequential budget, and teardown order. In a bro-managed repo, spawn through bro fleet agents/bro flow convoy instead — this recipe is for herdr-only environments and herdr plugin internals.