Point the local lab at GeuReflector and document the Config window.

Co-authored-by: Cursor <cursoragent@cursor.com>

CONTEXT.md

@@ -17,7 +17,7 @@ The conference that forwards audio among stations that have joined the same talk
 _Avoid_: server, bridge
 
 **Talk group**:
-A numbered audio room on the reflector. The station joins one talk group for the whole run.
+A numbered audio room on the reflector. The station is joined to one talk group at a time; changing it in the config starts a new session after Save.
 _Avoid_: channel, room
 
 **Talker**:
@@ -51,3 +51,11 @@ _Avoid_: TYPE, a config field the operator sets
 **Push-to-talk**:
 The operator holding the control that makes this station the talker. Releasing it returns the station to listening.
 _Avoid_: voice-operated transmit, a mute toggle
+
+**Config**:
+The JSON file that names how this station joins a reflector (host, port, callsign, auth key, talk group, certificate directory, logging). Default path `~/.funknetz.json`; `-c` may select another file.
+_Avoid_: settings file, preferences, treating PEMs as config fields
+
+**Config window**:
+The in-app form that edits the config. It is a modal over the station UI, not a separate OS window.
+_Avoid_: settings window, preferences dialog, a raw JSON editor as the primary UI