Add Android release signing configuration

- Update build.gradle with signingConfigs for release builds
- Enable minification and resource shrinking for release
- Add keystore.properties.example template
- Update .gitignore to exclude keystore and credentials

https://claude.ai/code/session_01WzGEr7t8hWFyiANo22iokS

android/.gitignore

@@ -52,10 +52,10 @@ captures/
 # Comment next line if keeping position of elements in Navigation Editor is relevant for you
 .idea/navEditor.xml
 
-# Keystore files
-# Uncomment the following lines if you do not want to check your keystore files in.
-#*.jks
-#*.keystore
+# Keystore files - DO NOT commit these
+*.jks
+*.keystore
+keystore.properties
 
 # External native build folder generated in Android Studio 2.2 and later
 .externalNativeBuild

android/app/build.gradle

@@ -1,5 +1,12 @@
 apply plugin: 'com.android.application'
 
+// Load keystore properties for release signing
+def keystorePropertiesFile = rootProject.file('keystore.properties')
+def keystoreProperties = new Properties()
+if (keystorePropertiesFile.exists()) {
+    keystoreProperties.load(new FileInputStream(keystorePropertiesFile))
+}
+
 android {
     namespace = "com.aethex.os"
     compileSdk = rootProject.ext.compileSdkVersion
@@ -16,10 +23,24 @@ android {
             ignoreAssetsPattern = '!.svn:!.git:!.ds_store:!*.scc:.*:!CVS:!thumbs.db:!picasa.ini:!*~'
         }
     }
+    signingConfigs {
+        release {
+            if (keystorePropertiesFile.exists()) {
+                storeFile file(keystoreProperties['storeFile'])
+                storePassword keystoreProperties['storePassword']
+                keyAlias keystoreProperties['keyAlias']
+                keyPassword keystoreProperties['keyPassword']
+            }
+        }
+    }
     buildTypes {
         release {
-            minifyEnabled false
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+            minifyEnabled true
+            shrinkResources true
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+            if (keystorePropertiesFile.exists()) {
+                signingConfig signingConfigs.release
+            }
         }
     }
 }

android/keystore.properties.example

@@ -0,0 +1,7 @@
+# Copy this file to keystore.properties and fill in your values
+# DO NOT commit keystore.properties to version control
+
+storeFile=app/aethex-release.keystore
+storePassword=your-store-password
+keyAlias=aethex
+keyPassword=your-key-password