feat: animated-QR transfer, Android reader, relative-locktime preservation, karen7 hermetic tests

android/app/build.gradle.kts

@@ -0,0 +1,67 @@
+plugins {
+    id("com.android.application")
+    id("org.jetbrains.kotlin.android")
+    id("com.chaquo.python")
+}
+
+android {
+    namespace = "life.after.bitcoin"
+    compileSdk = 35
+
+    defaultConfig {
+        applicationId = "life.after.bitcoin"
+        minSdk = 24
+        targetSdk = 35
+        versionCode = 1
+        versionName = "0.1.0"
+
+        // Chaquopy requires explicit ABI filters. Python 3.12 ships only for
+        // 64-bit ABIs: phones (arm64-v8a) + the common emulator image (x86_64).
+        ndk {
+            abiFilters += listOf("arm64-v8a", "x86_64")
+        }
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro",
+            )
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+    kotlinOptions {
+        jvmTarget = "17"
+    }
+    buildFeatures {
+        viewBinding = true
+    }
+}
+
+chaquopy {
+    defaultConfig {
+        version = "3.12"
+    }
+}
+
+dependencies {
+    implementation("androidx.core:core-ktx:1.13.1")
+    implementation("androidx.appcompat:appcompat:1.7.0")
+    implementation("androidx.activity:activity-ktx:1.9.3")
+    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.8.7")
+
+    // CameraX
+    implementation("androidx.camera:camera-core:1.3.4")
+    implementation("androidx.camera:camera-camera2:1.3.4")
+    implementation("androidx.camera:camera-lifecycle:1.3.4")
+    implementation("androidx.camera:camera-view:1.3.4")
+
+    // ML Kit on-device barcode scanning (QR only, no API key)
+    implementation("com.google.mlkit:barcode-scanning:17.3.0")
+}