Expand description
Suspension timeout scanner.
Iterates ff:idx:{p:N}:suspension_timeout for each partition, finding
suspended executions whose timeout_at score is <= now. For each, calls
FCALL ff_expire_suspension which re-validates and applies the configured
timeout behavior (fail/cancel/expire/auto_resume/escalate).
Reference: RFC-004 §Timeout scanner, RFC-010 §6.2