88: Rename Evelyn to EvelynStatusService and expose the calculated reference price

README.md

@@ -49,6 +49,20 @@ Nenjim Hub reads only `conf/NenjimHub.conf`; copy
 `conf/NenjimHub.conf.example` before first use and edit the ordered process
 list for the deployment role. The example is never loaded as runtime input.
 
+The Evelyn status processes use `evelyn.status.prod` and `evelyn.status.test`.
+When upgrading an existing deployment, replace `evelyn.service.prod` and
+`evelyn.service.test` with those IDs in private `conf/NenjimHub.conf`, preserving
+their order and enabled/commented selections. The instance names `Production`
+and `Test`, their `data/evelyn/<instance-name>/status.log` files, and history
+format version 1 remain unchanged.
+
+`com.r35157.evelyn.service.status.EvelynStatusService` exposes immutable status
+history and `AssetPrice getReferencePrice(Instant timestamp)`. The reference
+price is calculated on demand for the supplied instant and carries the canonical
+EVE/USDT trading pair. It works before startup and while sampling is stopped,
+without accessing Ticker or history storage. See [Evelyn](docs/Evelyn.md) for the
+curve and service contract.
+
 ## Release log:
 | Date             |   Version      | Description          |
 |:-----------------|:--------------:|----------------------|