Oban worker that routes an incoming signal to all waiting workflow runs that are
suspended on the signal's event_name within the same tenant.
Job args contain only signal_id. The worker:
- Fetches the
Chimeway.Signals.Signalrow by ID. - Delegates to
Chimeway.Workflows.route_signal/1, which atomically resumes every matchingWorkflowRunand appends aWorkflowTransitiontrace.
Returns :ok on success (including when zero workflows match) so Oban marks the
job :completed. Returns {:error, :signal_not_found} when the signal row no
longer exists; Oban will schedule a retry.