Function events_started 

pub fn events_started(exec_id: &str, pc_id: &str) -> String

events.started.<exec_id>.<pc_id> — v0.30 / PR α’ lifecycle event published by the agent just before spawning a script’s child process. Lets the backend project an in-flight row into execution_results (with finished_at = NULL) so the SPA Activity table can show running rows alongside finished ones. Backend subscribes via EVENTS_STARTED_FILTER.