add changelog entry

Author: EhabY

CHANGELOG.md

@@ -16,6 +16,10 @@
 - Every `coder.*` command now records a `command.invoked` telemetry event with
   its duration and outcome, so command latency and failures are captured
   alongside other local telemetry.
+- Connection lifecycle now records local telemetry: SSH process
+  discovery/loss/recovery with sampled network info, and reconnecting
+  WebSocket open, drop, reconnect, and state transitions, so connection
+  stability is captured alongside other local telemetry.
 
 ### Fixed