Auto-commit after successful build: update app gameplay/UI, improve build setup

Changed files:\nCrossCompileGitForAndroid.sh
app/build.gradle.kts
app/src/main/java/com/kawomi/githugandroid/GitRuntime.kt
app/src/main/jniLibs/arm64-v8a/libgit.so

app/src/main/java/com/kawomi/githugandroid/GitRuntime.kt

@@ -2,6 +2,7 @@ package com.kawomi.githugandroid
 
 import android.os.Build
 import android.content.Context
+import android.content.pm.ApplicationInfo
 import java.io.File
 
 class GitRepositoryRuntime(private val context: Context) {
@@ -9,7 +10,7 @@ class GitRepositoryRuntime(private val context: Context) {
     private val extractedGitDir = File(context.filesDir, "native-git/bin")
 
     fun startupBanner(): String {
-        return if (ensureNativeGitBinary() != null) {
+        return if (nativeGitBinary() != null) {
             "Welcome to GitHug Android. Native Git prototype ready."
         } else {
             "Welcome to GitHug Android. Native Git binary not bundled for this ABI yet; using in-memory fallback."
@@ -17,7 +18,7 @@ class GitRepositoryRuntime(private val context: Context) {
     }
 
     fun prepareLevel(level: Level): RepoState {
-        val nativeGit = ensureNativeGitBinary()
+        val nativeGit = nativeGitBinary()
         if (nativeGit == null) {
             return level.setup()
         }
@@ -52,7 +53,7 @@ class GitRepositoryRuntime(private val context: Context) {
     }
 
     fun execute(level: Level, currentRepo: RepoState, command: String): Pair<RepoState, List<String>> {
-        val nativeGit = ensureNativeGitBinary()
+        val nativeGit = nativeGitBinary()
         if (nativeGit == null) {
             return GitSandboxEngine.execute(currentRepo, command)
         }
@@ -78,7 +79,8 @@ class GitRepositoryRuntime(private val context: Context) {
         return buildList {
             addAll(GitSandboxEngine.commandReferenceLines())
             add("Native Git prototype:")
-            add("  extracted binary path: files/native-git/bin/git")
+            add("  preferred binary path: nativeLibraryDir/libgit.so")
+            add("  fallback binary path: files/native-git/bin/git")
             add("  selected ABI: ${Build.SUPPORTED_ABIS.firstOrNull() ?: "unknown"}")
             add("  helper commands: ls, pwd, cat, touch, mkdir, rm, echo")
         }
@@ -132,7 +134,7 @@ class GitRepositoryRuntime(private val context: Context) {
 
     private fun inspectSandbox(level: Level): RepoState {
         val sandbox = sandboxDir(level)
-        val nativeGit = ensureNativeGitBinary()
+        val nativeGit = nativeGitBinary()
         val filesOnDisk = sandbox.listFiles()
             ?.filter { it.isFile && it.name != ".git" }
             .orEmpty()
@@ -180,7 +182,22 @@ class GitRepositoryRuntime(private val context: Context) {
         )
     }
 
-    private fun ensureNativeGitBinary(): File? {
+    private fun nativeGitBinary(): File? {
+        val packaged = packagedNativeGitBinary()
+        if (packaged != null) {
+            return packaged
+        }
+
+        return ensureExtractedAssetGitBinary()
+    }
+
+    private fun packagedNativeGitBinary(): File? {
+        val nativeLibraryDir = context.applicationInfo.nativeLibraryDir ?: return null
+        val candidate = File(nativeLibraryDir, "libgit.so")
+        return candidate.takeIf { it.exists() && it.canExecute() }
+    }
+
+    private fun ensureExtractedAssetGitBinary(): File? {
         val extracted = File(extractedGitDir, "git")
         if (extracted.exists() && extracted.canExecute()) {
             return extracted