CellGuard app: on-device IMSI-catcher detection (Kotlin/Compose)

- foreground DetectorService: cgcap capture + on-device decode
- framework CellInfo source: real serving+neighbor towers, signal, carrier name
- FrameDecoder: 0x070F cell-info SIT decode
- block-2G/3G + detection toggles via cgctl; libsu root bridge
- silent status notification + edge-triggered alerts

app/proguard-rules.pro

@@ -0,0 +1,13 @@
+# CellGuard ProGuard rules
+
+# Keep the shared data model (used by on-device decoder + UI)
+-keep class com.seteclabs.cellguard.model.** { *; }
+
+# libsu uses AIDL + reflection for its root service; keep it intact.
+-keep class com.topjohnwu.superuser.** { *; }
+-keep interface com.topjohnwu.superuser.** { *; }
+-dontwarn com.topjohnwu.superuser.**
+
+# Kotlin metadata / coroutines
+-keepclassmembers class kotlin.Metadata { *; }
+-dontwarn kotlinx.**