Bulk-delete agents

Starts an asynchronous job that deletes up to 100 agents. Set force=true to delete execution history for every target, matching the single-agent delete endpoint; force must be a JSON boolean, and the strings "true" and "false" are rejected with 422 rather than coerced. A target with execution history and force=false fails with execution_history_exists. If the job itself fails, the target it stopped on carries delete_failed and every target behind it carries not_attempted, which means it was left untouched and is safe to resubmit.

Authorization is captured when the request is accepted, not when the job runs: a role or organization granted after acceptance does not widen what the job may delete.