docs: update README for v2.0.0-rc.2

Replace stale 1.0.0 header with rc2 pairing and v2 highlights pointer.

README.md

@@ -1,8 +1,8 @@
 # ADN DMR Peer Server
 
-**Version 1.0.0** — first stable release. Compatible with **adn-monitor 1.0.0**.
+**Version 2.0.0-rc.2** — pairs with **adn-monitor 2.0.0-rc.2** (report v2 slim wire + JSON HELLO).
 
-ADN DMR conference bridge server. Configuration is YAML; the codebase follows clean architecture (domain, application, infrastructure).
+ADN DMR conference bridge server. Configuration is YAML; the codebase follows clean architecture (domain, application, infrastructure). v2 adds integrated **PROXY**, **SubscriptionStore** routing, report v2 to the monitor, and a unified **`adn-server.py`** entrypoint (`--echo`, `--doctor`, `--no-proxy`). See [CHANGELOG.md](CHANGELOG.md).
 
 ## License