kami
883e93cecb
toJsonElement wrote a null map value as JSON null, but toAny threw on reading it back — asymmetric, so a single null-valued tool-arg made the whole session's events undecodable: 500 on /events AND a runtime WorkflowFailed when the projection rebuilt mid-run. A Map<String, Any> can't hold a null anyway, so drop null-valued keys on both serialize and deserialize, keeping the log round-trippable.