Sprint 1 complete: hybrid Compose + LibGDX architecture building

Full AL-001 through AL-008 implementation: shared/ module with ModuleType
enum, GameHost routing, StylusInputBridge, LineCorridorScreen with live
stroke rendering, LineScore (straightness + anglePrecision), score returned
to Compose hub via ActivityResult. Fixes LineScore field mismatch
(pressureConsistency → anglePrecision) caught during AL-009 build check.
Adds .gitignore and handoff notes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

android/build.gradle.kts

@@ -4,6 +4,8 @@ plugins {
 }
 
 val gdxVersion: String by project
+val composeBom: String by project
+val composeCompilerExtension: String by project
 val natives: Configuration by configurations.creating
 
 android {
@@ -27,6 +29,14 @@ android {
         jvmTarget = "17"
     }
 
+    buildFeatures {
+        compose = true
+    }
+
+    composeOptions {
+        kotlinCompilerExtensionVersion = composeCompilerExtension
+    }
+
     sourceSets {
         getByName("main") {
             assets.srcDirs(rootProject.file("assets"))
@@ -37,24 +47,49 @@ android {
 
 dependencies {
     implementation(project(":core"))
+    implementation(project(":shared"))
+
+    // LibGDX
     implementation("com.badlogicgames.gdx:gdx-backend-android:$gdxVersion")
     natives("com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-armeabi-v7a")
     natives("com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-arm64-v8a")
     natives("com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-x86")
     natives("com.badlogicgames.gdx:gdx-platform:$gdxVersion:natives-x86_64")
+
+    // Compose BOM
+    val composeBomDep = platform("androidx.compose:compose-bom:$composeBom")
+    implementation(composeBomDep)
+    implementation("androidx.compose.ui:ui")
+    implementation("androidx.compose.ui:ui-tooling-preview")
+    implementation("androidx.compose.material3:material3")
+    implementation("androidx.compose.material:material-icons-core")
+
+    // Activity + Navigation + Lifecycle
+    implementation("androidx.activity:activity-compose:1.9.2")
+    implementation("androidx.navigation:navigation-compose:2.8.0")
+    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.8.4")
+    implementation("androidx.lifecycle:lifecycle-viewmodel-compose:2.8.4")
+
+    // Material XML themes (for Activity window styling)
+    implementation("com.google.android.material:material:1.12.0")
 }
 
 tasks.register("copyAndroidNatives") {
     doFirst {
+        val validAbis = setOf("arm64-v8a", "armeabi-v7a", "x86", "x86_64")
         natives.files.forEach { jar ->
-            val outputDir = file("libs")
-            outputDir.mkdirs()
-            copy {
-                from(zipTree(jar))
-                into(outputDir)
-                include("*.so")
-                eachFile { path = name }
-                includeEmptyDirs = false
+            // Extract ABI from classifier, e.g. "gdx-platform-1.12.1-natives-arm64-v8a.jar" → "arm64-v8a"
+            val abi = jar.name.substringAfter("natives-").removeSuffix(".jar")
+            if (abi in validAbis) {
+                val outputDir = file("libs/$abi")
+                outputDir.mkdirs()
+                copy {
+                    from(zipTree(jar))
+                    into(outputDir)
+                    include("*.so")
+                    eachFile { path = name }
+                    includeEmptyDirs = false
+                }
             }
         }
     }