Script execution failures were only written to Serilog, never to the
site event log — SiteRuntime did not reference the SiteEventLogging
project. ScriptExecutionActor now resolves ISiteEventLogger and emits a
'script'/'Error' event on timeout and exception.
The event-log query handler was a per-node actor bound to that node's
local SQLite. A ClusterClient query could land on the standby (which
records no events) and return nothing. The handler is now a cluster
singleton with a proxy, so queries always reach the active node.
Joseph Doherty
17e24ddd20