Class AgentRunStepSaveQueue

Fire-and-forget save orchestration for agent-run steps — a thin, typed façade over the shared BaseEntitySaveQueue (@memberjunction/core). Keeps step writes OFF the hot loop so a run that creates many steps (e.g. a goal-driven Computer Use loop with one prompt step per iteration) never pays N synchronous DB round-trips on its critical path, and inherits the queue's race-proofing:

• Insert fires a step's "started" INSERT without awaiting; the step instance is the serialization key, so a later QueueUpdate chains after it (an UPDATE never races its INSERT).
• Insert also accepts one or more prerequisite steps (such as parentStep for FK_AIAgentRunStep_ParentID and an in-flight payloadAtStartSource step for FK_AIAgentRunStep_PayloadAtStartSourceStepID) plus an optional beforeInsert guard that runs after all prerequisites settle and immediately before step.Save() executes.
• QueueUpdate chains a force-persisted UPDATE (IgnoreDirtyState) after the step's INSERT. Its applyMutation runs INSIDE the post-INSERT task — after finalizeSave's init() + SetMany reload — so it can't be reverted (the "step stuck at Running / null TargetLogID" bug is structurally impossible). Mutating the shared entity before the INSERT resolves is the race this prevents.
• Flush awaits every queued save, drains, and reports failure counts. Call it at run/goal finalize.

Failures are logged, never thrown — persistence is observability and must not break the run.