3c9661e7f9
Add api/agent_ops.py: background loop performs small INSERT/UPDATE/DELETE on
public.sales_orders (PG), hr.employee_events (MySQL) and supplychain.events
(Mongo). Agent rows are tagged (notes/atc_agent); UPDATE/DELETE only ever touch
agent-created rows. Env kill-switch + interval + per-tick row cap. Endpoints
/api/agent-ops/{status,toggle,run-once}. Loop started in lifespan.