Prowl Agent Workflows

Author, validate, run, and participate in Prowl Agent Workflows — the `prowl.workflow/v1` bundles that orchestrate several live coding agents (launch, message, loop on verdicts, collect outputs, run built-in or local script actions) inside the running Prowl app. Use it to create, test, or debug a workflow action. Reach for this whenever the user wants a workflow created or edited ("write me a Prowl workflow that has two agents review each other", "add an input to the guessing-game workflow"), wants one executed ("use Prowl's adversarial-review workflow on this branch", "run the count-files workflow", "跑一下 xxx workflow"), asks about a run's progress or its result files, or…