Adding initial regression testing document

REGRESSION.md

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+# ETC Regression Tests 
+
+- **Build**: ETC R6 Build 6
+- **Date**: 6 March 2026
+
+## Desktop/Launcher Icons
+
+* [ ] JS8Call icon
+* [ ] fldigi icon
+* [ ] et-predict
+* [ ] et-aircraft
+* [ ] Terminal
+* [ ] Navit
+* [ ] Min web browser
+
+## et-predict
+
+* [ ] Map displays
+* [ ] Location geodetected
+* [ ] Callsign search 
+* [ ] Run prediction (e.g, ardop, ssb, vara-500, etc.)
+
+## GPS
+
+* [ ] Conky 
+  * [ ] lat,lon
+  * [ ] dynamic grid
+* [ ] et-api - http://localhost:1981/api/geo/position
+* [ ] GPS Time
+
+## User Configuration
+
+* [ ] Launch JS8Call before et-user init (not allowed)
+* [ ] et-user-restore
+* [ ] et-user
+
+## Radio
+
+* [ ] et-radio
+  * [ ] TX-500MP
+* [ ] JS8Call
+  * [ ] alsamixer levels
+    [ ] dynamic grid
+    [ ] Decode data
+    [ ] Tune up + full TX power out
+    [ ] SNR + full TX power out
+* [ ] et-aircraft-app
+  * [ ] Geolocation
+  * [ ] RTL-SDR v4
+  * [ ] RTL-SDR v3
+  * [ ] RTL-SDR v2
+  * [ ] ADS-B Exchange
+* [ ] et-mode
+     [ ] FT-857D + Winlink ARDOP
+
+
+## Bluetooth TNC
+
+* [ ] et-uv-pro
+
+
+## VARA
+
+* [ ] VARA restore
+* [ ] et-mode VARA FM (Winlink)
+* [ ] et-mode VARA HF (Winlink)
+
+## SDR
+
+* [ ] SDR++
+
+## SIGINT
+
+* [ ] Artemis
+
+## Security
+
+* [ ] gpa