Add RuntimeSettingsRead/RuntimeSettingsUpdate schemas with flow_retention_hours field (1-8760 hours), implement runtime_setting helper to initialize/fetch runtime system setting with 24h default, add require_super_admin guard to validate * permission, update agent_heartbeat to use configurable retention_cutoff from runtime settings instead of hardcoded 24h, replace /settings GET endpoint to return RuntimeSettingsRead with flow_retention_hours,
nessi
1531b7ea47