OptionaldependsKeys of members that must reach "completed" before this one is eligible to launch. A dependency that fails (or is skipped) skips this member too — the cascade a batch queue needs. Undefined/empty = launch as soon as capacity allows. (Sweeps never set this.)
Stable identifier for tracking/display + dependency references.
OptionalmaxMax launch attempts (>= 1). Default 1 (no retry).
One unit of work in a fan-out: a stable key plus the launch to perform.